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Blood is always red, never blue.

Human Anatomy, Physiology, and Medicine. Anything human!

Moderator: BioTeam

What color is deoxygenated blood?

Poll ended at Fri Apr 29, 2005 5:05 am

Red
4
80%
Blue
1
20%
 
Total votes : 5

Re: Blood is always red, never blue.

Postby ollie1 » Tue Oct 11, 2011 12:39 am

i cut my shin and instanly the blood ran down my leg and was blue and then turned red
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Postby clarisse » Sat Oct 22, 2011 2:26 am

I have never heard of blood being blue. My biology teacher always said that blood color is red, although it's true that veins are blue, but then again veins are not the blood itself.
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Postby ReginaM » Mon Oct 24, 2011 8:55 pm

It is quite interesting to look for the right answer about whether blood can be blue or not on the Internet. It seems everyone has the 'facts' to back there claim up. Technically you could also say that blood is clear if it has just white blood cells and no red blood cells.
Regina - working in the lab
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Postby biohazard » Tue Oct 25, 2011 6:50 am

I don't understand how this topic can keep going and going. Quite clearly, if you take a venous blood sample into an evacuated tube you can see the blood is dark red. If you use the same method to draw an arterial blood sample the blood is bright red. And yes, the blood is colourless if you remove erythrocytes, but I doubt we can call it blood anymore then.

Blood is blue if you have haemocyanin instead of haemoglobin, but that require you to be a horseshoe crab or similar, which utilizes copper instead of iron to carry oxygen. And I do not think we are talking about marine arthropods here...
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Re:

Postby claireoreo » Thu Mar 08, 2012 12:43 am

Chris4 wrote:Why do we lose 21 grams when we die? :D :twisted:

because overtime, the water in our body evaporates. :)
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Re:

Postby animartco » Sun Mar 11, 2012 4:34 pm

James wrote:So why do our lips turn blue when we die?

Possibly because blood gets darker as it congeals? But what about cyanosis? This does mean surely that when blood starts to lose oxygen it appears bluer through the skin. So deoxygenated blood must have less red colouration?
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Re:

Postby lenaroseduchannes » Thu Mar 22, 2012 5:53 am

James wrote:So why do our lips turn blue when we die?


When we die the red blood in our bodies drains down and settles into the back of our head kinda... without the bright red blood a tiny bit of red and the skin make the lips appear blue..
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Postby michimichi » Fri Mar 23, 2012 8:47 am

blue blood is just a representation for differentiate oxygenated from deoxygenated blood,blue blood is not literally blue..
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Re: Blood is always red, never blue.

Postby justuser » Sat Sep 29, 2012 8:50 am

The bood plasma relacement "Перфторан" developed in USSR has blue color.

http://ru.wikipedia.org/wiki/%D0%9F%D0% ... 0%B0%D0%BD

http://www.medline.ru/public/art/tom5/art8-perf1.phtml

http://vivovoco.rsl.ru/VV/JOURNAL/VRAN/PF/PERFTOR.HTM

The term "blue blood" was widely used in russian media as synonymous of the blood plasma replacement in articles about war in Afghanistan.
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Re: Blood is always red, never blue.

Postby ablettakbar » Tue Oct 16, 2012 6:06 am

Human blood is always red, however creatures like the Horseshoe crab have blue blood, this is because they do not use hemoglobin to attract oxygen (iron based) but instead use hemocyanin (copper based) it must be a more efficent way of delivering oxygen to the cells as they have survived all the great extinctions
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