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  1. #1
    Nikki's Avatar
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    The one-way flow of blood in veins is maintained by?

    The one-way flow of blood in veins is maintained by

    The one-way flow of blood in veins is maintained by ______________. positive pressure from the chest cavity
    blood pressure
    muscles pressing against the veins
    their thick walls
    valves

  2. #2
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    hello where is the answer

  3. #3
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    the answer is valves

 

 

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