The respiratory pump is best defined by which of the following?
a. the creation of a negative pressure in the thorax and a positive pressure in the abdomen, which helps pump blood toward the heart
b. the added force applied to blood flow from the breathing action of the lungs
c. the changes of pressure in the lungs, which help push oxygen into the blood and draw carbon dioxide out of the blood
d. the changes in pressure caused by the lungs, which prevent reverse flow of the blood back into the lungs
A
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