Why is blood red but the vein is green?



Answers:
I don't believe that guy called her a moron for giving the right answer. Yes blood without oxygen is blue but it may appear green due to you looking at it through your skin. I'm sure you've seen someone with blue lines on their body. When blood becomes oxygenated.the Fe is pulled to the center of the heme ring. It's actually this conformational change that produces the red color. Not rust. Also to comment. The Fe is contained within the porphyrin ring but not in a flat structure. It is partially off center and is pulled more equally within the ring structure with the addition of oxygen. If you looked it up you'd know I wasn't making ** up. Although i do apologize for the blue comment. But we see blue because of the absorption of light at the surface of our skin. At least while the blood is stil in circulation. You need to be less critical. Yes all of them are red but to the naked eye under the skin they clearly appear blue. It's not total "bullocks" for someone to assume such. The intelligent should learn to be teachers not arrogant tactless shrews.
It has something to do with the filtration of light by our skin. Only the blue/green waves get through. Misty Dawn down there is ignorant. Your blood is red. If our blood were blue we would turn blue when we blush. Kurdiatcha down at the bottom is obviously the only other educated person (or person that is not an idiot) that participates in Yahoo Answers.
You blood is actually blue, but when it is mixed w/oxygen it turns red. Some veins appear green because you see them under your skin-they are actually blue.
the oxygen changes the color, as well as aliens, lol
your blood is blue but when u start bleeding the blood hit oxygen and the oxygen turns the blood red
Blood gets its colour due to the presence of an oxygen carrier called Haemoglobin, an iron compound and thats why it looks red. (remember the colour of rust ??) Now when you have blood that has lost its oxygen, the redness reduces to a large extent, may be even start to look greenish. Veins carry blood that has given up its oxygen to the various body parts, back to the heart and lungs for purification. And veins, unlike arteries lie just below the skin and are easily visible. Now put all the above things together, hope it answers ur question. thanks ! :)
Geez I wish people would stop making ** up.

Anyone claiming that human blood is ever blue IS a moron.

Blood is never, ever blue. Blood is red. Deoxgenated blood is dark red, oxygenated blood is briaght red.

But blood is never, ever blue unless you have been exposed to some deadly posion.
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MistyDawn said " You blood is actually blue, but when it is
>>>>>>>>> mixed w/oxygen it turns red.

This is absolute rubbish without any truth whatsoever. See the links below.

>>>>>>Some veins appear green because you see them under
>>>>>>your skin-they are actually blue.

Utter bollocks. All veins are red. NEever, ever blue except in cases of extreme poisoning.


>>>>I work for a dr.

If you work for a doctor then it is as a cleaner, or a receptionist at best.

>>>>>and have taken many medical classes.

And failed them all. Nobody who has passed freshman biology could believe that human blod is ever blue. It's physiologically and chemically imposible.

xxkiskekyxx said "Yes blood without oxygen is blue"

No, it isn't. Never. Simply can not happen.

>>>>>>When blood becomes oxygenated.the Fe is pulled to
>>>>>> the center of the heme ring.

No it bloody isn't.

The iron is chelated by the heme ring permanently. You'd be dead if that were not the case. When blood becomes oxygenated O2 replaces CO2 in theligand structure, but the iron alwatys remains equally complexed with heme group.

>>>>>We are not Smurfs

PMSL
Well; As perhaps the only person here that has actually drawn blod from living patients as well as corpses I can definitively say that blood is never blue. It is bright red when drawn from arteries and dark red when drawn from veins or corpses.

The medicine information post by website user , ByeDr.com not guarantee correctness , is for informational purposes only and is not a substitute for medical advice or treatment for any medical conditions.

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