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Artery walls are muscular allowing the artery to constrict or expand as need be in order to control blood pressure. The blood in arteries is under direct pressure from the heart.

Veins contain small little valves so that the blood can only flow in the direction of the heart. Venous blood is under little pressure and relies on these little valves to get the blood back to the heart. As the body moves, this also helps move venous blood along.

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