Why do arteries have thick and elastic walls and veins are thin-walled and have valves?

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Detailed Solution

Arteries have thick and elastic walls because they transport blood under great pressure from the heart to other organs of the body. Blood is collected from different organs and returned to the heart by veins. Veins have valves to ensure blood flow in one direction.Veins are thin-walled because the blood there is no longer under pressure.

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