Why are the vessels of the venous system, particularly the small venules and veins, termed capacitance vessels?
A) They transmit and maintain the head of perfusion pressure.
B) They can alter their capacity to maintain adequate perfusion.
C) They determine the afterload on the left ventricle.
D) They maintain a constant environment for the body's cells.

Question

Quizplus · Accepted Answer

By quickly changing its holding capacity, the venous system can match the volume of circulating blood to that needed to maintain adequate perfusion. Accordingly, the components of the venous system, especially the small, expandable venules and veins, are termed capacitance vessels.

Why Are the Vessels of the Venous System, Particularly the Small