How can the heart be strong enough to pump blood up your legs against gravity?
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Veins Explained
Veins must work against gravity to return blood the heart. The muscles of the leg help that process, and valves within the veins usually keep the moving blood from flowing back down toward the feet.
Answered by
1
Answer:
Veins must work against gravity to return blood the heart. The muscles of the leg help that process, and valves within the veins usually keep the moving blood from flowing back down toward the feet.
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