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
They use the arms because it’s the easiest and most convenient part. and they go with a vein because of blood flow direction. The needle goes in at an angle so the blood pushing “down” the arm is pushed into the needle for collection.
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