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Which of the following is NOT a action of angiotensin II to raise blood pressure?

A. stimulates the thirst center in the hypothalamus
B. stimulates production of aldosterone
C. causes vasodilation in arterioles
D. increases peripheral resistance

1 Answer

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Final answer:

Option C, which states that angiotensin II causes vasodilation in arterioles, is NOT an action of angiotensin II to raise blood pressure since angiotensin II actually causes vasoconstriction.

Step-by-step explanation:

The correct answer to the question is option C: causes vasodilation in arterioles. Angiotensin II is known to be a powerful vasoconstrictor, which means it causes narrowing of the blood vessels, thereby increasing blood pressure. This is contrary to vasodilation, which is the widening of the blood vessels and would lower blood pressure instead. Actions A and B are both correct: angiotensin II stimulates the thirst center in the hypothalamus, encouraging fluid intake, and recruits the release of aldosterone, which increases sodium reabsorption in the kidneys, leading to increased blood volume and pressure. Option D, increases peripheral resistance, is also a true action of angiotensin II as it increases resistance in the arteries, which raises blood pressure.

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