Blood Moves Forward Through Veins Because of All of the Following

Question

Blood moves forward through veins because of all of the following except
A) the pressure in the veins is lower than in the arteries.
B) pumping by the smooth muscle in the wall of the vein.
C) the respiratory pump.
D) valves in the veins preventing the backward flow of blood.
E) muscular compression.

Accepted Answer

While smooth muscle in the vein walls can contribute to pumping blood forward, it is not the primary reason blood moves forward through veins. The other choices (A, C, D, and E) are all correct mechanisms for the movement of blood in veins.