During a blood drive, Shaun noticed that the nurse punctured his vein to connect the tube for withdrawing blood. Why is blood obtained through veins and not from the arteries when collecting blood?
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Veins are easy to access as the arteries are located deeper under the skin while veins are at superficial location as compared to them.
The walls of the veins are thinner than that of arteries as less smooth muscle surround them, so we face less intervention while piercing through them.
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It is because blood flows under low pressure in veins unlike blood in arteries that flow under high pressure. Blood flows in veins in a steady flow that is efficient for blood drive due low pressure of blood flow. Also veins have valves that prevents blood from flowing back to the heart while arteries do not have valves, this enables veins to be suitable for blood drive compared to arteries.
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