Medical Quiz

Circulation and Excretion Quiz

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

Select your answer:


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