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2 July, 14:05

How could the adaption of valves in leg vains allow a human to better survive in its environment.

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  1. 2 July, 16:15
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    The answer is that healthy legs have veins with smooth, elastic walls that are perfectly designed to adapt to the changes in pressure within a vein. Veins have valves that keep blood moving in one direction: back toward the heart. As the leg muscles are activated, the venous valves open to allow one-way flow in the direction of the heart.
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