Why are valves present in the heart and veins?
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Heya,..
here is ur answer..
valves are present in the heart and veins ..
because ...The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by theheart, are under much higher pressure than blood in veins so there is no need for valves in arteries to prevent back flow...
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Answer:
Blood flows with low pressure and speed in veins as compared arteries thus to prevent back flow of blood, veins have valves.
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