Question

In blood transfusion, blood is drawn from a vein rather than an artery, why?
Give Reason of this question
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Answer 1

Blood immediately collected from an arterial source is bright red in color due to the effect of oxygen binding the ferric-heme complex. Any blood stored over time – including the interval normally required for blood processing prior to transfusion – undergoes metabolic change to render it into a non-oxidative state of metabolism. Hence, any oxygen would be consumed and an unlikely source of bright coloration at the time of infusion. This does not eliminate other unusual reasons for the observed difference in color which would all be speculative at this point in time.