Multiple Choice
Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
I. changing the strength of heart contraction
II. constricting and relaxing smooth muscle in the walls of arterioles
III. opening or closing precapillary sphincters
A) only I and II
B) only I and III
C) only II and III
D) I, II, and III
Correct Answer:
Verified
Correct Answer:
Verified
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