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In the respiratory pump process to increase venous return, inhalation results in a(n) ________ in the thoracic cavity, which causes the inferior vena cava and right atrium to expand and fill with blood.

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Answer:

Decrease in pressure

Explanation:

In the respiratory pump process to increase venous return, inhalation results in a decrease in pressure in the thoracic cavity, which causes the inferior vena cava and right atrium to expand and fill with blood.

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