Given the very low pressure for the blood's return to the heart shown in section III, which of the following is NOT a mechanism for assisting blood's movement?
a. The presence of one-way valves embedded in the vein's walls
b. A thoracic pump powered by breathing movements
c. A transpirational pull using hydrogen bonding
d. Skeletal muscle assists
e. The reduced pressure in the relaxing heart chambers after the blood is forced out
Ans: c. A transpirational pull using hydrogen bonding
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