Which of the Following Mechanisms Are Used to Regulate Blood

question 49

Multiple Choice

Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
I.changing the force of heart contraction
II.constricting and relaxing sphincters in the walls of arterioles
III.adjusting the volume of blood contained in the veins
IV.synthesizing new capillaries

• A)only I and II
• B)only I and III
• C)only II and III
• D)I, II, and III
• E)I, II, and IV

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