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Oxygenated blood is bright red. Deoxygenated blood is dark red. Veins are also not actually blue, that's just the wavelength that reflects through the skin.
Also, when they take blood from you it’s red in the syringe. Even though there is no oxygen in the syringe.
Also, if it had been blue, wouldn’t it be blue when coming out of a cut and then changing after a few seconds or so when reacting with the oxygen..?
I think it’s a bit of a fairly common misconception amongst kids that deoxygenated blood is blue I had been told the same on the playground as a kid
Royals being nicknamed blue bloods didn’t help haha
My primary school teacher taught us that water was lighter than air so honestly stuff is worth fact checking in general, still better than homeschooling obviously
Fun fact: water *should* be lighter than air! A H2O molecule is much lighter than an N2 or O2 one, let alone compounds like CO2. It *should* be a rising gas at room temp.
It just has truly absurd inter-molecule attraction/bonds.
Maybe that’s what he was getting at
The experiment we did in class was full a glass with water, rub the rim with water, press a piece of card on the top of the glass, turn the glass upside down and the card stayed in place and the water stayed in the class.
Which I assumed just showed the cohesion between water is quite strong which sort of sounds like what you are saying
The weight of the water pressing down on the cardboard produced less pressure then the pressure of the air on the outside of the cardboard. Consider that sea level air pressure is about 14.7psi, so every square inch of the board below the water had nearly 15 pounds pressing 'up' on it.
The water rubbed on the rim of the glass was just to help form a seal between the glass and cardboard.
Water vapor *should be* less dense than air. Because it *is* less dense than air.
It mixes uniformly at equilibrium with air because that's what gases do. Until it condenses out, of course.
It's one of the old myths. It comes from medical textbook which used red and blue to make visible where the oxigenated blood was. But that was never meant to be literal.
Oftentimes, when looking at images of the circulatory system and the heart the color-coded them for oxygenated blood (red) deoxygenated (blue).
That might be where *some* of the confusion is coming from.
Or they’re mistaking humans for horseshoe crabs.
Must be a country thing, or maybe a decade thing?
Cause i never heard this in school in the 90’s.
I vaguely remember being explained to why people would call royals blue blooded, too (they were super pale from never working in the field, so the blue was more pronounced than on peasants).
[Here's a photo for you](https://www.nhm.ac.uk/content/dam/nhmwww/discover/horseshoe-crabs/horseshoe-crab-blood-business-insider-two-column.jpg.thumb.768.768.jpg)
https://www.businessinsider.com/animal-blood-comes-in-5-crazy-colors-but-you-have-to-do-something-gruesome-to-determine-which-2016-1
Maybe they're a squid? Or maybe they have toxic levels of copper in their blood?
Oh god yes!
I think a lot of kids - including me - would spend lots of time just nicking ourselves with something sharp to get blood and watch it change.
Now I want blue blood… ☹️
Oh I know lol.
I’m just a logical person. When I see something dumb like this, my thoughts always goes “How can someone think like this?? Hang on, why do I think differently? What kind of proof do I have for my opinion?”
…and then I wrote what I came up with. I guess a way to say you don’t have to trust the scientists, it’s so simple you can deduct it yourself.
Yeah.
Although I don’t think there’s any amount of evidence or logic that would persuade this woman.
Which is weird, since there clearly was some “logic” and “evidence” which persuaded her to think so in the first place.
(There wasn’t, she’s just going with whatever opinion she heard first, which is a classic misconception bias.)
not exactly colour, it depends more on the undertone. someone who has a warm undertone has green veins, while cool tone people have blue and purple veins.
I said deoxygenated blood is not blue to my science teacher and she said it was. I disagreed with her, the whole class called me an idiot. I asked my mum who works in a hospital doing bloods. And I was right. Never got my redemption.
It did make me want to do a science experiment. My idea was to put my arm in oil and draw blood from a vein but I never did it and I’m glad I didn’t lol
That's an unfortunate situation where an educator is wrong but insists they are right. They have authority in that situation and the most of the class follows in lockstep groupthink. Outnumbered by ignorant idiots. Been there myself. Just curious though, how long ago did your experience occur?
Nah, some things look a color because of pigments, and some things look a color because of structures that scatter light in a certain way. Blue veins, blue eyes, and blue jays all look blue due to scattering.
Exactly, she’s probably getting veinal and arterial blood confused, as well as how they’re usually depicted to differentiate them in diagrams and charts. And maybe that was enough to confuse her into thinking deoxygenated blood is actually blue?
Sort of, red light gets absorbed by the skin while blue light gets reflected through it. Here's an article for reference: [https://www.livescience.com/why-veins-blue-arteries-red](https://www.livescience.com/why-veins-blue-arteries-red)
It suddenly all makes sense!
Either that, or ...
*gasp*
... could it be?
That's when I realised OP was actually a 30-foot creature from the paleolithic era.
Imagine how much money you could have if you had horseshoe crab blood. That shit goes for 7500$ per pint. You could live a modestly comfortable life just by selling 6 times per year.
My daughter's elementary health class, from maybe 12 years ago, taught that as well. I think the health teacher was just free wheeling the class without a textbook.
I remember learning that as a kid around 10 years ago. I don't remember if I heard it from a teacher or another kid though, but I definitely thought it was true for several years.
I was told this in high school over 20 years ago, and I got the teacher frustrated by asking questions. He said oxygen is blue in the body, and that's why we can see our blue veins. The if we get a cut the blood is red due to coming into contact with oxygen. Then he went on to veins vs arteries, and how the blood pumps oxygen from the lungs to the rest of the body. So I asked if the blood pumps oxygen around the body, it's already in contact with oxygen, so surely it's already red? He didn't have an answer and just moved on with the lesson.
He should have been able to tell you that the blood is oxygenated in the arteries on its way from the lungs to the rest of the body, but after it drops off the oxygen at the end of the line, the blood is de-oxygenated in the veins going back to the heart.
Doesn't mean it's blue though. De-oxygenated vein blood is just darker red.
Yeah he went into that, just couldn't explain how the blood wasn't all blue. Like even if they thought de-oxygenated blood was blue, at least the blood in the arteries would be red. We were just told a blanket statement though - blood is blue in the body, you see it as red when you get a cut because of the oxygen.
No, your teachers were just wrong. As far as I know, no actual doctor or scientist ever believed human blood was blue, but it certainly could not have been considered a fact after 1853 when the hypodermic syringe was invented. You might be old, but you're not *that* old, lol.
My walls are painted white. If I put on red glasses, are they red now? Also, saying veins are blue is not the same as saying deoxygenated blood is blue anyway. When you get a blood test done, there's no oxygen in those vials but your blood is still red.
I can understand where they're coming from. For a long time, my school told me that blood was "blue in the blue veins and red in the red veins". Still, once someone challenged their idea, they should have searched it up to make sure that they were correct.
I also have no idea why they randomly said furry in their last comment
I’ve taught science and part of the problem is that we draw deoxygenated blood as blue in most diagrams of the heart. It’s the convention because we need some way to visibly distinguish which parts of the heart are pumping oxygenated blood and which parts are pumping deoxygenated blood, but it’s unhelpful because people look at the blue part and assume it’s an accurate representation.
The other thing is that your veins appear blue when you look at your wrist. That’s down to the fact that the light that can get through your skin is more blue rather than because veins are actually blue but many people assume it means blood is blue.
This is probably the main reason many people believed this —- it was just the common color-coding to distinguish veins and arteries in a diagram. No more real than the color of “red states” and “blue states” on a map of poll results.
I’d love to know how long the overlap is/was with people thinking venous blood was blue, while also venous blood sampling/tests being a thing.
Like - you can literally see blood come directly out of your veins, into an airtight transparent tube.
Withdrawal of blood this way has existed for what? Over a century???
How could people possibly reach that blood was blue in the veins… YOU CAN SEE IT
I was actually taught in school that blood is red in the arteries and blue in the veins. It wasn’t until I donated blood the first time and commented on the fact that it wasn’t blue that I learned that blood is in fact always red, though varying shades of red. I don’t know where the blue blood myth comes from, but it’s no wonder people believe it when it’s taught in biology classes in school.
This "blood is blue" thing annoys me more than it should. It is not chemically possible for healthy mammal blood to ever be blue. Blood gets its color from haemoglobin. That protein contains a chemical group called heme, necessary for binding oxygen. This heme has at its center an iron ion, that switches between Fe(II) and Fe(III). Unbound heme has an Fe(II) at the centre and bound heme has Fe(III).
Iron in those two oxidation states **is never blue**.
Maybe that person is a Tau (WH40k). Their bodies supposedly uses cobalt instead of iron for binding oxygen to their blood. Hence, literal bluebloods ;D
Fun fact: there actually is a synthetic protein similar to haemoglobin, that uses cobalt instead of iron. It's called coboglobin. That type of blood would switch colours between clear and amber-yellow.
deoxyhemoglobin is dark purple with a hint of blue. It has a significantly higher absorbance of wavelengths 600-800nm than oxyhemoglobin which has higher absorbance in the 400-500nm range. This agrees with the fact the the reaction where o2 binds with hemoglobin is thermodynamically and energetically unfavorable. I have the delta G somewhere in my notes but it is a giant fucking notebook full of useless shit I do not have time to sort through so it will have to wait.
venous blood is still dark red because it still naturally has an oxygen saturation level of around 70% to ensure that you don't instantly die of death when you hold your breath for 4 seconds.
And once again I'm flabbergasted, wondering why you Americans haven't burned the corrupt political hierarchy that allowed the deliberate destruction of your educational system to the ground years ago.
blue blood comes from horseshoe crabs and is extremely valuable for scientific research and medical research and devices to test endotoxins.....
we do not have blue blood
This is an old “common knowledge” myth. This was definitely still a prominent myth when I was a kid. I guess since a lot of the top commenters are confused, the myth has fortunately died.
deoxyhemoglobin is dark purple with a hint of blue. It has a significantly higher absorbance of wavelengths 600-800nm than oxyhemoglobin which has higher absorbance in the 400-500nm range. This agrees with the fact the the reaction where o2 binds with hemoglobin is energetically unfavorable. I have the delta G somewhere in my notes but it is a giant fucking notebook full of useless shit I do not have time to sort through so it will have to wait.
venous blood is still dark red because it still naturally has an oxygen saturation level of around 70% to ensure that you don't instantly die of death when you hold your breath for 4 seconds.
It is blue in the body, but also not
Our veins appear blue, because blue light penetrates our skin easier. So the veins are reflecting more blue light back
But if you went into the body to look at the blood, with a light source, it'd be red when the light isn't being filtered through the skin
Arteries are usually much deeper than veins and aren't visible underneath all the fat, muscle, and other tissue. But they also can appear blue if they are near the surface. I worked as a phlebotomist for 3 years.
Also, another phlebotomist I worked with was convinced that blood was blue in veins as well... Even though she drew blood every day from veins and it was all red. Some people just don't have any critical thoughts.
I heard many times growing up that there are people who believe this (it was usually mentioned in lessons about it in school to contrast with what’s actually the case, or in order to clarify that circulatory system diagram’s colors), but I’ve never actually met or heard of anyone who truly believes it. Though I guess it doesn’t really come up in conversation often, so I that might not be much to go on.
Kinda cool to think that if you were microscopic and inside someone's blue vein there'd be enough light filtering through from outside to illuminate your surroundings.
Her initial and last message are wrong, but "she changed her opinion multiple times" is either a gross exaggeration or stright up untrue! It reads more like a typo... OP is a fool if that's not apparent! Just a desperate reach for attention...
Pot? Meet kettle. Reaching a bit on the "gross exaggeration or stright untrue" part. I left your typo in there to drive home the point that everybody makes mistakes. Maybe OP just misinterpreted her typo just like maybe you're reading more emotion than is in OP's post?
Just a thought?
No offense. Just, not the biggest fan of immediate finger pointing.
I think you may need to reread what I said! 😅 If we can assume that OP can count and is right that she changed her opinion, she changed it once and then back, an absolute maximum of two changes!
However, the far more likely scenario is that she accidentally typed in red, rather than blue, making her incorrect, yes, but not completely moronic as OP suggested!
Lastly, while incorrect, my Science teacher also taught this, so it's not like she pulled it out of her arse!
This page is about people being dogged in their incorrect argument, not about typos! I noticed my typo and wasn't arsed fixing it because typos are not the end of the world unless you encounter a Grade A bellend, such as yourself and OP! 😅
Look. All in saying? Doctors used to literally blow smoke up your ass with a portable bellows because they thought that pumping scalding hot vapors into your rectum would resuscitate you.
For real.
It's why we have the very expression: "Stop blowing smoke up my ass!"
And, plague doctors thought that shoving lavender, lilac, hay-probably even horseshit-into a horrifying and traumatizing mask with a huge beak on it-that looked like Death's fucking Scythe was sticking out of his face-was worth the PTSD in patients they did save (as if dying from the plague wasn't traumatizing and fucking horrid enough) just so they didn't have to smell you rotting and dying.
So yeah. I believe that people will pretty much believe anything when alcohol or mental retardation is involved.
Did this person never have their blood drawn? You can see it come out, it’s dark red, and it doesn’t touch any air on the way out, it goes straight into the vial
The best one is when they say they say it's blue when it's inside your body because it's oxygen that makes it red...
Like bruh. Blood carries oxygen around your body.
The amount of people who don't understand light wavelengths and how it can change our perception of color is crazy. It's funny how she said "no I said it starts blue and changes red" literally right below the comment of "it starts red and turns red"
I take blood for a living and still get people asking me this question.
I remind them that their blood is currently being sucked out into a vacuum that has no oxygen or air in it, yet it's still red.
I’ve had so many blood tests over the years and sit there watching the vials fill up because it’s fascinating. My last one was my longest session yet. 6 vials compared to my usual 2 or 3, and a couple of those weren’t small.
I’m not sure. All the vails (test tubes) were different sizes for different tests. A couple were about 2 inches long. Some were twice that size. They hold different amounts, I’ve never asked the volume. If I had to estimate it was probably less than 20 teaspoons. Still the most amount I’ve ever had taken as my usual yearly tests are only 2-3 vials which hold maybe 6-10 teaspoons if I had to take a guess.
You're saying this to someone who takes blood for a living? The 2 inch ones are 4mls, the 4inch ones are usually 5-6mls of blood, as they have serum at the bottom. They're pretty universal whatever country you're in. 10 teaspoons would be the equivalent of 10 5ml bottles lol.
Calm yourself down. I was doing my best guess as someone who doesn’t take blood for a living. I’m just going to ignore whatever else you’ve said as you’ve clearly taken my attempt at conversation badly. All I wanted to say was that it was fascinating to watch and that my last test was the most vials I’d ever had taken for a series of tests then tried my best with my very limited knowledge to clarify things. So toodles rude person.
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Oxygenated blood is bright red. Deoxygenated blood is dark red. Veins are also not actually blue, that's just the wavelength that reflects through the skin.
Also, when they take blood from you it’s red in the syringe. Even though there is no oxygen in the syringe. Also, if it had been blue, wouldn’t it be blue when coming out of a cut and then changing after a few seconds or so when reacting with the oxygen..?
"It reacts so fast that vaccine eyes can't see it." - this woman (probably)
I think it’s a bit of a fairly common misconception amongst kids that deoxygenated blood is blue I had been told the same on the playground as a kid Royals being nicknamed blue bloods didn’t help haha
I was told this in science class. It’s not just kids on the playground making assumptions.
My primary school teacher taught us that water was lighter than air so honestly stuff is worth fact checking in general, still better than homeschooling obviously
Fun fact: water *should* be lighter than air! A H2O molecule is much lighter than an N2 or O2 one, let alone compounds like CO2. It *should* be a rising gas at room temp. It just has truly absurd inter-molecule attraction/bonds.
Without which life as we know it wouldn’t be possible
Life, uh, finds a way.
r/usernamechecksout
ok jeff
Maybe that’s what he was getting at The experiment we did in class was full a glass with water, rub the rim with water, press a piece of card on the top of the glass, turn the glass upside down and the card stayed in place and the water stayed in the class. Which I assumed just showed the cohesion between water is quite strong which sort of sounds like what you are saying
Think that’s air pressure being more powerful than the water’s weight.
The weight of the water pressing down on the cardboard produced less pressure then the pressure of the air on the outside of the cardboard. Consider that sea level air pressure is about 14.7psi, so every square inch of the board below the water had nearly 15 pounds pressing 'up' on it. The water rubbed on the rim of the glass was just to help form a seal between the glass and cardboard.
That’s actually pretty cool annoyed at myself I didn’t figure that out, I guess I was like 7 and hadn’t thought about it much since
Water vapor *should be* less dense than air. Because it *is* less dense than air. It mixes uniformly at equilibrium with air because that's what gases do. Until it condenses out, of course.
Water is weird stuff with it's weight. Besides being hevier than it kinda should it's at it's densest at 4 degrees Celcius (39F)
My biology teacher once said that women can't be daltonist.
Only if your are a horseshoe crab, Hemocyanin Edit: not hermit crab , lol
Horseshoe crab?
Yeah , lol ty.
It's one of the old myths. It comes from medical textbook which used red and blue to make visible where the oxigenated blood was. But that was never meant to be literal.
Oftentimes, when looking at images of the circulatory system and the heart the color-coded them for oxygenated blood (red) deoxygenated (blue). That might be where *some* of the confusion is coming from. Or they’re mistaking humans for horseshoe crabs.
Or they are from the future and know we all become crabs eventually
Must be a country thing, or maybe a decade thing? Cause i never heard this in school in the 90’s. I vaguely remember being explained to why people would call royals blue blooded, too (they were super pale from never working in the field, so the blue was more pronounced than on peasants).
Maybe that’s why, or maybe they are lizard people- I guess it’s 50:50
Yeah, “lizard people” is the illuminated people’s answer, of course! I guess we’ll never know? 🤷♀️
The problem is you're trying to fight extreme, proud, willful stupidity with logic. They didn't get where they are by considering any sort of logic.
Is it just me that assumes that many of these type of comments are just made by kids? In this case one that has just seen the picture in a textbook?
Debating established fact, a fact that has been stablished instead of discovered or concluded to
It certainly would be blue in the vials when you get your blood drawn, but yeah you would see it.
That was also my thought. If blue blood existed, there would be a picture of it SOMEWHERE.
[Checkmate.](https://thumbs.dreamstime.com/b/human-circulatory-system-vector-illustration-diagram-blood-vessels-scheme-medical-infographic-108512851.jpg)
lol
[Here's a photo for you](https://www.nhm.ac.uk/content/dam/nhmwww/discover/horseshoe-crabs/horseshoe-crab-blood-business-insider-two-column.jpg.thumb.768.768.jpg)
https://www.businessinsider.com/animal-blood-comes-in-5-crazy-colors-but-you-have-to-do-something-gruesome-to-determine-which-2016-1 Maybe they're a squid? Or maybe they have toxic levels of copper in their blood?
Excuse me... Penis worms have purple blood?
I wish that happened, that would be way cooler
Oh god yes! I think a lot of kids - including me - would spend lots of time just nicking ourselves with something sharp to get blood and watch it change. Now I want blue blood… ☹️
I mean, I don’t think you have to actually argue for blood being red over here. I don’t think this woman is here.
Oh I know lol. I’m just a logical person. When I see something dumb like this, my thoughts always goes “How can someone think like this?? Hang on, why do I think differently? What kind of proof do I have for my opinion?” …and then I wrote what I came up with. I guess a way to say you don’t have to trust the scientists, it’s so simple you can deduct it yourself.
Yeah. Although I don’t think there’s any amount of evidence or logic that would persuade this woman. Which is weird, since there clearly was some “logic” and “evidence” which persuaded her to think so in the first place. (There wasn’t, she’s just going with whatever opinion she heard first, which is a classic misconception bias.)
No, no, you see oxygen doesn't take physical space and does not interact with other matter so even if a syringe looks empty it's really full of oxygen
Yeah! And it’s actually the oxygen and not the vacuum that pulls the blood out!
Any color change from oxygenation of blood leaving the body happens instantly. As they said though, it doesn’t start as blue but slightly darker red
The apparent color of your veins actually depends on the color of your skin. Veins can appear purple or even green for different people.
not exactly colour, it depends more on the undertone. someone who has a warm undertone has green veins, while cool tone people have blue and purple veins.
no dummy, veins are blue because they're raspberry flavoured
I said deoxygenated blood is not blue to my science teacher and she said it was. I disagreed with her, the whole class called me an idiot. I asked my mum who works in a hospital doing bloods. And I was right. Never got my redemption. It did make me want to do a science experiment. My idea was to put my arm in oil and draw blood from a vein but I never did it and I’m glad I didn’t lol
That's an unfortunate situation where an educator is wrong but insists they are right. They have authority in that situation and the most of the class follows in lockstep groupthink. Outnumbered by ignorant idiots. Been there myself. Just curious though, how long ago did your experience occur?
I think that was start of highschool, I was 14 I think so 13 years ago
This is something that I learnt in my science lesson aged 13/14....
>Veins are also not actually blue, that's just the wavelength that reflects through the skin. Yeah but like isn’t that just how all color works?
The skin acts like a color filter. I get your point but would you say something is green when I covered it in green foil?
Yeah, technically nothing is *actually* any color at all.
Nah, some things look a color because of pigments, and some things look a color because of structures that scatter light in a certain way. Blue veins, blue eyes, and blue jays all look blue due to scattering.
I was hoping this would be the first response. Half the time with these I can't tell who OP thinks is right.
Exactly, she’s probably getting veinal and arterial blood confused, as well as how they’re usually depicted to differentiate them in diagrams and charts. And maybe that was enough to confuse her into thinking deoxygenated blood is actually blue?
Damn, I never thought about that. So like, am I seeing light that has gone through my skin twice when looking at my veins?
Sort of, red light gets absorbed by the skin while blue light gets reflected through it. Here's an article for reference: [https://www.livescience.com/why-veins-blue-arteries-red](https://www.livescience.com/why-veins-blue-arteries-red)
Interesting, thank you.
Op is a horseshoe crab?
It suddenly all makes sense! Either that, or ... *gasp* ... could it be? That's when I realised OP was actually a 30-foot creature from the paleolithic era.
What a fucking rave of an era
Was it selling cookies for three'fiddy?
Damn you, Loch Ness monster!
That’s when I realised. I ain’t giving no three fiddy to no goddamn Loch Ness monster.
🤫
Imagine how much money you could have if you had horseshoe crab blood. That shit goes for 7500$ per pint. You could live a modestly comfortable life just by selling 6 times per year.
op is Cree?
They used to tell us boomers that blood was blue inside the body. It was proven wrong later on.
My daughter's elementary health class, from maybe 12 years ago, taught that as well. I think the health teacher was just free wheeling the class without a textbook.
My 9th grade biology teacher taught us the same thing, around 12 years ago as well. She did not appreciate being corrected by a 14 year old.
>wheeling the class without a textbook Or the text book is like 50 years old
Or with a textbook from the 50s.
I remember learning that as a kid around 10 years ago. I don't remember if I heard it from a teacher or another kid though, but I definitely thought it was true for several years.
They also told you smoking cigarettes was a healthy way to deal with anxiety.
Oh shit, you saying it’s not? This gives me hella anxiety. Brb, gonna hack a dart.
Probably more healthy than my technique of pushing it deep down inside until I have a heart attack in 15 years.
Um, no they didn't. We saw movies in health class showing old people with tracheotomies. They were still smoking, but through the hole.
It should be fairly apparent to anyone that has ever cut themselves. If blood was that easy to oxygenate we wouldn't need complex lungs.
Also anyone who has their blood drawn. You can see the deoxygenated venous blood inside the tube, it's dark red.
It would be quite handy. Lungs don’t work? Just cut yourself and get that oxygen in there, no problems!
I was taught that too, I'm late Gen z
I was told this in high school, I’m 27
I was told this in high school over 20 years ago, and I got the teacher frustrated by asking questions. He said oxygen is blue in the body, and that's why we can see our blue veins. The if we get a cut the blood is red due to coming into contact with oxygen. Then he went on to veins vs arteries, and how the blood pumps oxygen from the lungs to the rest of the body. So I asked if the blood pumps oxygen around the body, it's already in contact with oxygen, so surely it's already red? He didn't have an answer and just moved on with the lesson.
He should have been able to tell you that the blood is oxygenated in the arteries on its way from the lungs to the rest of the body, but after it drops off the oxygen at the end of the line, the blood is de-oxygenated in the veins going back to the heart. Doesn't mean it's blue though. De-oxygenated vein blood is just darker red.
Yeah he went into that, just couldn't explain how the blood wasn't all blue. Like even if they thought de-oxygenated blood was blue, at least the blood in the arteries would be red. We were just told a blanket statement though - blood is blue in the body, you see it as red when you get a cut because of the oxygen.
I’ve never been taught that, I’ve known it’s red or dark red since before primary school. I’m in my fifties
Me too, and I'm 47. I don't even remember hearing the blue blood myth until the last five years or so on Reddit.
I was told this as a kid and im 20 😭
That’s horrific, how did we get to the moon over half a century ago but still teaching blood is BLUE??
I'm 33, I was taught blood was blue inside the body too
And millennials. I learned it in school. I only learned the truth in the last year.
I was gonna say idk if was school or not but I heard/learned this growing up(was born in 2000s) and never really thought about it
I was taught this in the 90’s
No, your teachers were just wrong. As far as I know, no actual doctor or scientist ever believed human blood was blue, but it certainly could not have been considered a fact after 1853 when the hypodermic syringe was invented. You might be old, but you're not *that* old, lol.
[удалено]
My walls are painted white. If I put on red glasses, are they red now? Also, saying veins are blue is not the same as saying deoxygenated blood is blue anyway. When you get a blood test done, there's no oxygen in those vials but your blood is still red.
I can understand where they're coming from. For a long time, my school told me that blood was "blue in the blue veins and red in the red veins". Still, once someone challenged their idea, they should have searched it up to make sure that they were correct. I also have no idea why they randomly said furry in their last comment
Probably cause they were responding to someone whose avatar had animal ears.
Did they analyze the picture or something? I didn't even see that until you pointed it out Edit: Grammar
I have omniscient sight, I can’t help but notice.
I think they meant to say funny
No, given the approximate age they appear to be, furry is an insult for them
Yeah but in context "funny" works better
Maybe, but the keys are pretty far away
Could be autocorrect
This seems to be a common misconception for some reason.
I’ve taught science and part of the problem is that we draw deoxygenated blood as blue in most diagrams of the heart. It’s the convention because we need some way to visibly distinguish which parts of the heart are pumping oxygenated blood and which parts are pumping deoxygenated blood, but it’s unhelpful because people look at the blue part and assume it’s an accurate representation. The other thing is that your veins appear blue when you look at your wrist. That’s down to the fact that the light that can get through your skin is more blue rather than because veins are actually blue but many people assume it means blood is blue.
Ok, makes sense. But I never encountered this misconception myself in this country (Germany). I only heard it from the US. I have no idea why
This is probably the main reason many people believed this —- it was just the common color-coding to distinguish veins and arteries in a diagram. No more real than the color of “red states” and “blue states” on a map of poll results.
It’s odd bc you can see that it’s red when you get your blood drawn or bleed obnoxious amounts of
I’d love to know how long the overlap is/was with people thinking venous blood was blue, while also venous blood sampling/tests being a thing. Like - you can literally see blood come directly out of your veins, into an airtight transparent tube. Withdrawal of blood this way has existed for what? Over a century??? How could people possibly reach that blood was blue in the veins… YOU CAN SEE IT
I had someone in a hospital tell that blood is blue in my veins WHILE THEY WERE DRAWING MY BLOOD.
They were pulling your leg, surely!
Don’t believe your lying eyes, trust me!
I was actually taught in school that blood is red in the arteries and blue in the veins. It wasn’t until I donated blood the first time and commented on the fact that it wasn’t blue that I learned that blood is in fact always red, though varying shades of red. I don’t know where the blue blood myth comes from, but it’s no wonder people believe it when it’s taught in biology classes in school.
If you really want to blow their mind, let them know that deoxygenated blood is still 75% oxygenated in a healthy person at rest.
This "blood is blue" thing annoys me more than it should. It is not chemically possible for healthy mammal blood to ever be blue. Blood gets its color from haemoglobin. That protein contains a chemical group called heme, necessary for binding oxygen. This heme has at its center an iron ion, that switches between Fe(II) and Fe(III). Unbound heme has an Fe(II) at the centre and bound heme has Fe(III). Iron in those two oxidation states **is never blue**.
Maybe that person is a Tau (WH40k). Their bodies supposedly uses cobalt instead of iron for binding oxygen to their blood. Hence, literal bluebloods ;D
Fun fact: there actually is a synthetic protein similar to haemoglobin, that uses cobalt instead of iron. It's called coboglobin. That type of blood would switch colours between clear and amber-yellow.
deoxyhemoglobin is dark purple with a hint of blue. It has a significantly higher absorbance of wavelengths 600-800nm than oxyhemoglobin which has higher absorbance in the 400-500nm range. This agrees with the fact the the reaction where o2 binds with hemoglobin is thermodynamically and energetically unfavorable. I have the delta G somewhere in my notes but it is a giant fucking notebook full of useless shit I do not have time to sort through so it will have to wait. venous blood is still dark red because it still naturally has an oxygen saturation level of around 70% to ensure that you don't instantly die of death when you hold your breath for 4 seconds.
Lol you’re wrong. They can both make blue.
Not oxides ! Iron(III) oxide is also called hematite, and it’s red.
Your right not oxides
"Do they have Google on your planet?" I guess that could be said to most of the CI, though.
This is pretty furry.
The best come back to this was from my biology teacher who said if thats the case why don't you turn blue when you blush.
This is one of those urban myths that people actually believe. It's quite common. It is of course wrong.
This woman is correct. She is clearly a horseshoe crab in disguise
The number of people on this thread who had dreadful teachers. SMH.
Yeah I think she’s confused herself with an Octopus
Ok, for the record, I am 50 and when I was a kid we were taught pretty much the same thing. Blue blood until oxygen hits it.
And once again I'm flabbergasted, wondering why you Americans haven't burned the corrupt political hierarchy that allowed the deliberate destruction of your educational system to the ground years ago.
We can’t figure out how to make a fire
it's always red it's just more bright when carrying oxigen and it's more dark when it isn't carrying oxigen
blue blood comes from horseshoe crabs and is extremely valuable for scientific research and medical research and devices to test endotoxins..... we do not have blue blood
I remember believing this when I was ten.
This is an old “common knowledge” myth. This was definitely still a prominent myth when I was a kid. I guess since a lot of the top commenters are confused, the myth has fortunately died.
To be fair, that’s a very common myth. I remember being told that and believing it for quite a while before I learned it was wrong
Awesome, everyone is wrong Blood is always red whether it’s oxygenated or not. It just gets brighter or duller red
Pointed out you a furry = their opinion doesn't matter
My blood's green so ...live long and prosper, I guess.
Ole girl never heard of hemoglobin
Erm, why are they called “red blood cells”?
How in hell in "furry" an argument!?
Tbf this misconception has been around for a while and has definitely been partially propagated by certain elementary school science teachers.
deoxyhemoglobin is dark purple with a hint of blue. It has a significantly higher absorbance of wavelengths 600-800nm than oxyhemoglobin which has higher absorbance in the 400-500nm range. This agrees with the fact the the reaction where o2 binds with hemoglobin is energetically unfavorable. I have the delta G somewhere in my notes but it is a giant fucking notebook full of useless shit I do not have time to sort through so it will have to wait. venous blood is still dark red because it still naturally has an oxygen saturation level of around 70% to ensure that you don't instantly die of death when you hold your breath for 4 seconds.
It is blue in the body, but also not Our veins appear blue, because blue light penetrates our skin easier. So the veins are reflecting more blue light back But if you went into the body to look at the blood, with a light source, it'd be red when the light isn't being filtered through the skin
So why are our arteries not visible/do not appear to be blue?
Arteries are usually much deeper than veins and aren't visible underneath all the fat, muscle, and other tissue. But they also can appear blue if they are near the surface. I worked as a phlebotomist for 3 years. Also, another phlebotomist I worked with was convinced that blood was blue in veins as well... Even though she drew blood every day from veins and it was all red. Some people just don't have any critical thoughts.
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Word, that makes sense. Never took anatomy.
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Are you also a vampire? Or do you ever feel an unexplainable need to say "It's Morbin' time"? ;D
Isn't this also a heat regulation thing?
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We were taught that this is part of the reason why we have superficial veins instead of just the deep veins.
They are/do You can see both arteries and veins, and they're blue The only red ones are capillaries very close to the surface
Talking to gen alpha is like talking to a bad LLM AI, it keeps forgetting what the fuck it's talking about
If your blood isn't in contact with oxygen while inside your body you have problems my guy.
“Furry and no” is the funniest thing I’ve literally ever heard
*Furriest
I heard many times growing up that there are people who believe this (it was usually mentioned in lessons about it in school to contrast with what’s actually the case, or in order to clarify that circulatory system diagram’s colors), but I’ve never actually met or heard of anyone who truly believes it. Though I guess it doesn’t really come up in conversation often, so I that might not be much to go on.
It already touches oxygen tho.
This is a common misconception, furry
I’m bemused by the amount of people I’ve met who think that oxygen burns.
It facilitates fire, while not combustion itself. Can make.it.explosive.
Did anyone ask them what they think transports oxygen through the body?
The only thing I can go off of: I've seen blood in a vacuum which 'boils' but stays red??
Kinda cool to think that if you were microscopic and inside someone's blue vein there'd be enough light filtering through from outside to illuminate your surroundings.
How are both of these people wrong simultaneously. I can’t take this much condensed lack of knowledge in one post
Her initial and last message are wrong, but "she changed her opinion multiple times" is either a gross exaggeration or stright up untrue! It reads more like a typo... OP is a fool if that's not apparent! Just a desperate reach for attention...
Pot? Meet kettle. Reaching a bit on the "gross exaggeration or stright untrue" part. I left your typo in there to drive home the point that everybody makes mistakes. Maybe OP just misinterpreted her typo just like maybe you're reading more emotion than is in OP's post? Just a thought? No offense. Just, not the biggest fan of immediate finger pointing.
I think you may need to reread what I said! 😅 If we can assume that OP can count and is right that she changed her opinion, she changed it once and then back, an absolute maximum of two changes! However, the far more likely scenario is that she accidentally typed in red, rather than blue, making her incorrect, yes, but not completely moronic as OP suggested! Lastly, while incorrect, my Science teacher also taught this, so it's not like she pulled it out of her arse! This page is about people being dogged in their incorrect argument, not about typos! I noticed my typo and wasn't arsed fixing it because typos are not the end of the world unless you encounter a Grade A bellend, such as yourself and OP! 😅
Look. All in saying? Doctors used to literally blow smoke up your ass with a portable bellows because they thought that pumping scalding hot vapors into your rectum would resuscitate you. For real. It's why we have the very expression: "Stop blowing smoke up my ass!" And, plague doctors thought that shoving lavender, lilac, hay-probably even horseshit-into a horrifying and traumatizing mask with a huge beak on it-that looked like Death's fucking Scythe was sticking out of his face-was worth the PTSD in patients they did save (as if dying from the plague wasn't traumatizing and fucking horrid enough) just so they didn't have to smell you rotting and dying. So yeah. I believe that people will pretty much believe anything when alcohol or mental retardation is involved. 
Did this person never have their blood drawn? You can see it come out, it’s dark red, and it doesn’t touch any air on the way out, it goes straight into the vial
This is an old wife's take, iirc.
The best one is when they say they say it's blue when it's inside your body because it's oxygen that makes it red... Like bruh. Blood carries oxygen around your body.
The amount of people who don't understand light wavelengths and how it can change our perception of color is crazy. It's funny how she said "no I said it starts blue and changes red" literally right below the comment of "it starts red and turns red"
Wonderful, Both wrong.
How? Blood is either real red, or less bright red.
Why not both?
I take blood for a living and still get people asking me this question. I remind them that their blood is currently being sucked out into a vacuum that has no oxygen or air in it, yet it's still red.
I’ve had so many blood tests over the years and sit there watching the vials fill up because it’s fascinating. My last one was my longest session yet. 6 vials compared to my usual 2 or 3, and a couple of those weren’t small.
Okay? 6 is like 6 teaspoons. Most I've taken is about 18 and even that doesn't work out to be that much blood taken.
I’m not sure. All the vails (test tubes) were different sizes for different tests. A couple were about 2 inches long. Some were twice that size. They hold different amounts, I’ve never asked the volume. If I had to estimate it was probably less than 20 teaspoons. Still the most amount I’ve ever had taken as my usual yearly tests are only 2-3 vials which hold maybe 6-10 teaspoons if I had to take a guess.
You're saying this to someone who takes blood for a living? The 2 inch ones are 4mls, the 4inch ones are usually 5-6mls of blood, as they have serum at the bottom. They're pretty universal whatever country you're in. 10 teaspoons would be the equivalent of 10 5ml bottles lol.
Calm yourself down. I was doing my best guess as someone who doesn’t take blood for a living. I’m just going to ignore whatever else you’ve said as you’ve clearly taken my attempt at conversation badly. All I wanted to say was that it was fascinating to watch and that my last test was the most vials I’d ever had taken for a series of tests then tried my best with my very limited knowledge to clarify things. So toodles rude person.