When the doctor/nurse takes blood from you, why do they try to find a vein, not an artery? And also why is this mainly done on the arm as opposed to other parts of the body?
In: Biology
Arteries are deeper in the tissue and as many have said, difficult to get to. They also have layers of smooth muscle surrounding them. If you poke them, they squeeze up and get just that much more difficult to draw from.
Veins are much easier to get at.
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