- A Aldosterone
- B Insulin
- C Atrial natriuretic factor
- D Calcitonin
Correct answer: A. Aldosterone
Explanation: Low blood pressure activates the renin-angiotensin system, leading to aldosterone release, which increases Na+ and water reabsorption to raise blood volume and pressure.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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