The function of angiotensin II is to ________.

Question

BlackTom AI · Accepted Answer

The question asks about the function of angiotensin II. Below, I evaluate each option to see whether it aligns with the known actions of angiotensin II.
Option A: 'decrease release of ADH' — Angiotensin II actually stimulates the release of antidiuretic hormone (ADH/vasopressin) from the posterior pituitary, which promotes water reabsorption in the kidneys. Therefore, this option contradicts the physiological effect and is incorrect.
Option B: 'decrease water absorption' — By promoting ADH release and acting on the kidneys to conserve sodium and water, angiotensin II tends to increase water reabsorption, not decrease it. This makes B incorrect because it describes the opposite of angiotensin II’s action.
Option C: 'decrease arterial blood pressure' — Angiotensin II is a potent vasoconstrictor that raises systemic vascular resistance and thereby increases arterial blood pressure. So this statement is false.
Option D: 'decrease the production of aldosterone' — Angiotensin II stimulates the zona glomerulosa of the adrenal cortex to secrete aldosterone, which increases sodium and water reabsorption and raises blood pressure. Thus, decreasing aldosterone production is incorrect.
Option E: 'constrict arterioles and increase blood pressure' — This accurately captures the primary hemodynamic effect of angiotensin II: constricting arterioles (increasing afterload) and elevating blood pressure, along with stimulating aldosterone release and ADH, which further support fluid retention and pressure maintenance. This option aligns with established physiology and is correct.
In summary, options A, B, C, and D describe actions opposite to or inconsistent with angiotensin II’s known roles, while option E correctly states its vascular constriction effect and its contribution to raising blood pressure.

The function of angiotensin II is to ________.

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