Question

How can the heart be strong enough to pump blood up your legs against gravity?​

Answer 1

Answer:

Because of the valves, the blood can only move in one direction as it gets squeezed along. So it is a combination of blood pressure from the heart's pumping action, the valves, and muscle movement that gets the blood up the legs against gravity.

Answer 2

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