blood

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Offline wolfbane360

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blood
« on: 31/05/2006 19:52:50 »
if your blood only gose red after its been in contact with oxygen if you bleed in space then blood should be blue.

is this right
 

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Offline JimBob

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Re: blood
« Reply #1 on: 31/05/2006 21:13:54 »
No, it isn't.

The hemoglobin turns red when oxygen is added to the cell, but if there were no oxygen in the cell, bleeding in space would not occur. Have you ever seen a body bleed??



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Offline rosy

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Re: blood
« Reply #2 on: 31/05/2006 23:05:44 »
Not quite, Jim. That would only apply if it were oxygenated blood that was being, as it were, bled.
I wouldn't be the bright red of oxygenated blood, tho' blue is
Actually, I'm not sure how long it takes blood coming out of a vein to become oxygenated in air... there's a lot less surface are for blood coming out of a wound than going through the lungs.
Anyway, blue's a bit of an overstatement for the colour of deoxygenated blood, it's more like deep purpley red.
Obviously there'd be other issues if you were in a position to be bleeding direct into the vacuum of space, the human body's designed to work at an external pressure of 1 Atm, but that's not really what we're talking about.

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Offline neilep

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Re: blood
« Reply #3 on: 31/05/2006 23:45:54 »
*le sigh*...just thought I'd chuck this in here http://www.thenakedscientists.com/forum/topic.asp?TOPIC_ID=1038 Chris gives a good explanation here.


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