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Explain how blood returns to the heart even though it must sometimes travel from the lower extremities against gravity?
Wiki User
∙ 13y ago
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Wiki User
∙ 12y ago
Wiki User
∙ 13y agoMovement of you leg muscles helps squeeze the veins, pushing the blood up through them. Veins also contain valves that prevent the blood from going back down once it has gone up a vein.
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