Which of the following is not true of the respiratory pump?
A. Contraction of the diaphragm causes an increase in the volume of the thoracic cavity, and a decrease in pressure.
B. It is a mechanism that helps with venous return to the heart.
C. More blood enters the heart during expiration than inspiration.
D. Increased venous return to the heart causes the heart rate to increase.
E. All of these are true of the respiratory pump.
Answer: C
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