why is blood drawn from vein, not from artery during the blood donation?
Answers
Answer:
This process is especially common for plasma and platelets. For direct transfusions a vein can be used but the blood may be taken from an artery instead. In this case, the blood is not stored, but is pumped directly from the donor into the recipient.
Explanation:
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Answer:
Many veins tend to lie quite superficially and are easy to access. Arteries tend to lie deeper and need some knowledge of anatomy and a steady hand to stick a needle into them.
A drawback is that you need to place an occlusive pressure on the artery after you've removed a needle from it as due to the high pressures within, it can bleed a lot into the surrounding tissues.
But the most important thing to remember is that whilst puncturing a vein to sample blood, even should the vein get thrombosed (blocked by a blood clot) no harm occurs as there are many other veins to conduct blood back to the heart. Should an artery get blocked, there is a high likelihood that the tissues that it supplies might die and that's never a good thing.
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