Question

why do veins have thin walls as compared to arteries

Answer 1

arteries have to pump the blood to distinct parts of the body,thus it has thicker wall than veins

Answer 2

heart pumps the oxygenated blood and artries have to carry that pumped oxygenated blood to all the other parts of body due to the pumping blood has a lot of pressure
so, artries are thick walled
where as,
veins carry deoxygenated blood from the body parts to heart . this do not have any pressure
so, veins are thin walled

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