Which statement does NOT describe aldosterone activity?

Which statement does NOT describe aldosterone activity?

• A. It increases sodium reabsorption in the kidney
• B. It increases potassium secretion
• C. It increases water retention
• D. It results in higher sodium levels in the urine

Answer: (D)

Aldosterone’s main job is to conserve sodium and water while pushing potassium out of the body. It acts on the kidney’s distal tubules and collecting ducts to increase sodium reabsorption, which in turn drives water retention and expansion of blood volume. It also promotes potassium secretion into the urine. Because of the sodium reabsorption, it would not raise sodium levels in the urine; in fact, it lowers urinary sodium. So the statement claiming higher sodium levels in the urine does not describe aldosterone activity.

Aldosterone’s main job is to conserve sodium and water while pushing potassium out of the body. It acts on the kidney’s distal tubules and collecting ducts to increase sodium reabsorption, which in turn drives water retention and expansion of blood volume. It also promotes potassium secretion into the urine. Because of the sodium reabsorption, it would not raise sodium levels in the urine; in fact, it lowers urinary sodium. So the statement claiming higher sodium levels in the urine does not describe aldosterone activity.