The respiratory pump facilitates the return of blood to the heart by
A) decreasing the pressure gradient between abdominal and thoracic veins during inspiration.
B) raising the pressure gradient between abdominal and thoracic veins during inspiration.
C) raising the pressure gradient between abdominal and thoracic veins during expiration.
D) decreasing the pressure gradient between abdominal and thoracic veins during expiration.
E) squeezing blood from the rhythmic contraction of the diaphragm muscle.
Correct Answer:
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