Blood moves forward through veins because of all of the following, except
a. pumping by the smooth muscle in the wall of the vein.
b. valves in the veins preventing the backward flow of blood.
c. the respiratory pump.
d. the pressure in the veins is lower than in the arteries.
e. muscular compression.
Answer: a. pumping by the smooth muscle in the wall of the vein.
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