Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
A. changing force of the contraction of the heart
B. constricting and relaxing sphincters in the walls of arterioles
C. adjusting the volume of the blood in the veins
D. all the above
E. only a and b
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Other quiz: Cardiovascular System
What is the main organ of the circulatory system?
A. small intestine