As blood flows away from the heart, how does overall blood pressure in vessels change? Why?
A. Blood pressure decreases, because of the effects of friction between the vessel walls and the moving blood.
B. Blood pressure increases. Otherwise the blood would not flow up toward the heart.
C. Blood pressure increases, because vessel diameter narrows with distance from the heart, which increases the force on the blood.
D. Blood pressure decreases, because blood vessels are passive and cannot exert any force on the moving blood.
Ans: A. Blood pressure decreases, because of the effects of friction between the vessel walls and the moving blood.
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