Q:

What causes venous blood to return to the heart?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:12.3| Question number:4

waelhammad

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2022-10-18

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What causes venous blood to return to the heart?

The pumping action of the heart.
The squashing action of muscles, and valves in the veins.
Rhythmic vasoconstriction and valves in the veins.
Gravity, valves and the negative pressure generated by the atria emptying.

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waelhammad

2022-10-18

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B: Valves prevent blood in veins from flowing away from the heart, while contracting skeletal muscle compresses the veins and this pushes blood through them towards the heart (as the valves prevent blood form being pushed in the other direction.

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