why do veins have valves whereas arteries don't have
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Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
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Arteries exert pressure on Blood flow where as veins don't. that's why veins need valves to prevent backflow of deoxygenated blood.
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