Answer: Aldosterone.
- 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.
Filtrate flows through four functionally distinct stages of the nephron: Bowman's capsule filters blood, the PCT reabsorbs most useful substances unconditionally, the Loop of Henle builds a concentration gradient via counter-current exchange, the DCT secretes selected substances, and the collecting duct performs the final ADH-controlled water reabsorption.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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