Even if we took oxygen out of the air the blood would still be a darker maroon colour rather than bright red
This is how blood is taken for research purposes. The nurses take patients’ blood for me in ‘vacutainers’ – these are tubes in which a vacuum is exerted which draws the blood from the vein into the tube
So the blood I receive is usually darker red
Usually I then extract DNA from the blood and use the DNA in my experiments!
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