_______ are present to prevent the back flow of blood in the heart.

arteries

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veins

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valves

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aorta

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Solution

The correct option is C valves
Valves prevent backflow of blood from ventricles to atria when ventricles contract, and from the blood vessels to the ventricles when the ventricles relax.

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Due to presence of _______ , back flow of blood is prevented in veins.

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