why are vines provide the valves
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The main function of the valves in veins is to prevent back flow of blood. ... Blood in veins is under much lower pressure as it is returning to the heart from the various organs and tissues and so has a risk of back flow if the valves are not present to prevent it.
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valves help the return of blood to the heart by opening when the blood flows toward the heart and closing when blood might flow backward because of gravity.
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