Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
A) constricting and relaxing sphincters in the walls of arterioles
B) changing the force of heart contraction
C) adjusting the volume of blood contained in the veins
D) all of the above

Question

Quizplus · Accepted Answer

All of the listed mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates. Constricting and relaxing sphincters in the walls of arterioles control blood flow to capillary beds, changing the force of heart contraction alters cardiac output and thus blood pressure, and adjusting the volume of blood contained in the veins affects venous return and cardiac output.

Which of the Following Mechanisms Are Used to Regulate Blood