Aldosterone from the adrenal cortex acts on the kidney to increase the reabsorption of
Correct answer: A. sodium ions
- A. sodium ions
- B. glucose
- C. urea
- D. plasma proteins
Explanation
Aldosterone stimulates the distal tubule and collecting duct to pump sodium back into the blood in exchange for potassium, and since water follows sodium osmotically, blood volume and pressure rise as well. It therefore regulates salt balance, while ADH regulates water directly. Glucose reabsorption is complete without any hormonal control, and urea is a waste the kidney is trying to remove.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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