Which of the following statements about vascular compliance is accurate?
A) Arteries are much more distensible than veins.
B) Veins can act as a reservoir for storing large quantities of blood.
C) Arteries have thick muscular walls that constrict tightly, thereby ejecting blood without storing it for later use.
D) A continuous flow through the capillaries occurs primarily during systole.
Ans: B
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The most distensible of all vessels are the veins, which can increase their volume with only slight changes in pressure, allowing them to function as a reservoir for storing large quantities of blood that can be returned to the circulation when it is needed. Although arteries have a thicker muscular wall than veins, their distensibility allows them to store some of the blood that is ejected from the heart during systole, providing for continuous flow through the capillaries as the heart relaxes during diastole.
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