How can you say that can blood flow to the heart against gravitational force from your legs
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The blood can flow to the heart against the gravitational force as the heart pumps the blood with very high pressure and with this pressure, the blood can return to the heart from the legs.
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Because of the valves, the blood can only move in one direction as it gets squeezed along. So it is a combinationof blood pressure from the heart's pumping action, the valves, and muscle movement that gets the blood up the legs against gravity
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