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

Question

Quizplus · Accepted Answer

All of the mechanisms listed (changing the force of heart contraction, constricting and relaxing sphincters in the walls of arterioles, and adjusting the volume of blood contained in the veins) are used to regulate blood pressure in the closed circulatory system of vertebrates. The force of heart contraction determines the amount of blood ejected from the heart with each beat, while sphincters in the walls of arterioles can restrict blood flow to various organs and tissues as needed. Adjusting the volume of blood contained in the veins affects the overall blood volume and therefore blood pressure.

Which of the Following Mechanisms Are Used to Regulate Blood