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One way that enables blood in your leg veins to return to the heart in spite of the downward pull of gravity

One way that enables blood in your leg veins to return to the heart in spite of the downward pull of gravity
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One way that enables blood in your leg veins to return to the heart in spite of the downward pull of gravity

User Daniel Kucal
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1 Answer

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Veins have valves that allow them to build up pressure and thus pump blood against gravity
User Aysonje
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