As in the arms and legs, blood flows against gravity and is

prevented from flowing back by

1 The extremely low pressure of venous blood

2 Valves

3 Movements in the surrounding muscles

4 None of these

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As in the arms and legs, blood flows against gravity and is prevented from flowing back by 1 T..

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(2) Valves

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As in the arms and legs, blood flows against gravity and is prevented from flowing back by 1 T..

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4 none of these

Is This Answer Correct ?    2 Yes 2 No

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