★ 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
Preview next quiz:
Urea is a product of the breakdown of proteins and nucleic acids. Where is it produced in the body?
A. liver
B. kidney
C. lung
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