bedankt, voor de reactie,
zelf vond ik dat zuurstofarmbloed eigenlijk een 'zwartere' kleur heeft, en zuurstofrijk bloed rood is. De blauwe kleur is inderdaad de kleur van sommige venen die hemelsblauw schijnen te zijn. Als het bloed uit het lichaam stroomt , is het meestal rood omdat het tijd genoeg heeft om te binden met zuurstof, als het echter zeer snel eruit loopt dan blijft het zwart.
>`The colour of blood flowing through the arteries is red and those
>through the veins blue?
No, actually the "color" of venous blood is rather dark. There is no
blue tint at all, but just a sort of blackish-muddy look with red, not
blue, undertones (looking at venous blood in the clear plastic return
line of a heart-lung machine, for example). That venous blood is
"blue" is one of the great myths of our time.
>Why is the colour of the blood which flows
>through the veins bluish ?
It isn't. Some veins are quite blue (almost sky blue) when seen in
surgery, but this is not due to the blood, and is seen even in veins
filled with saltwater. It's a color of the distended vessel wall
itself, and has something to do with collagen or some other protein.
> Also if any vein gets cut the blood which
>comes out is again coloured only red. Why ?'
In slow bleeds the blood gets exposed to oxygen in the air fast
enough, and is in thin enough layers, to turn red. Rapid bleeding from
veins really is dark as it runs down the body <g>. Trust me. Even
after it pools, rapidly spilled venous blood can still remain quite
dark, right up until it congeals, in the right circumstances. Much
depends on how thin it gets smeared.
Steve Harris, M.D.