Question

How does angiotensin II (ANG II) directly affect the kidneys?

A.) It increases sodium reabsorption in the proximal tubule.
B.) It stimulates vasopressin release.
C.) It causes potassium secretion in the distal tubule.
D.) It causes sodium secretion in the proximal tubule.

Answer 1

Angiotensin II increases sodium reabsorption in the proximal tubule of the kidneys, which leads to water reabsorption and an increase in blood volume and pressure.

Step-by-step explanation:

Angiotensin II (ANG II) has several direct effects on the kidneys. The correct answer to how ANG II directly affects the kidneys is A) It increases sodium reabsorption in the proximal tubule. ANG II is a component of the renin-angiotensin system, which plays a crucial role in regulating blood pressure and fluid balance. One of its actions is to constrict blood vessels, which increases blood pressure. In the kidneys, ANG II promotes the release of aldosterone from the adrenal cortex. Aldosterone then acts on the renal tubules, leading to the increased reabsorption of sodium, alongside which water is also reabsorbed, ultimately increasing blood volume and pressure.