why arteries have thick elastic wall
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Thick walls of arteries help them to resist the pressure of flow of blood in them. Arteries are elastic so as to produce enough pressure to push the blood and help it flow.
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Because arteries are the first vessels that the heart pumps blood through, they experience the highest blood pressure, so they have thick elastic walls to withstand the high pressures. ... Small arteries, such as arterioles, are less elastic and have more smooth muscle than the larger arteries.
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