why does the blood flow in one direction only in the veins?
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Answer:
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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the vein are thin walled. there are valves present in the vein which prevent back flow of blood. blood thus, flow towards the heart only
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