Site of ADH action is______________?
Correct answer: D. Collecting tubule
- A. Proximal tubule
- B. Loop of Henle
- C. Vasa recta
- D. Collecting tubule
Explanation
ADH inserts aquaporin-2 water channels into principal cells of the late distal tubule and collecting ducts, increasing water permeability and concentrating urine. Among the listed choices, the collecting tubule is the best site.
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