Which of the following assists in returning the blood to the heart through the veins?

waelhammad

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2022-10-18

valves in the veins, the effect of breathing, gravity.
valves in the veins, the effect of breathing, squashing action of muscles, gravity.
the effect of gravity, the pumping action of the heart.
the effect of breathing, squashing action of muscles, the right ventricle.

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waelhammad

2022-10-18

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B: Each of the four assist in some way. Choice A omits the action of muscular movement. The heart has no role in vascular return.

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