Which hormone secreted by the posterior pituitary increases water reabsorption in renal collecting ducts?
Answer and explanation
Correct answer: B. Antidiuretic Hormone
- Step 1: Hypothalamic osmoreceptors detect elevated plasma osmolarity during dehydration. Step 2. The posterior pituitary releases ADH, which inserts aquaporin-2 water channels into collecting duct apical membranes, conserving water. Answer: Antidiuretic Hormone (ADH or Vasopressin). Why not the others: Aldosterone promotes Na+ reabsorption and K+ excretion from adrenal cortex; ANP promotes sodium and water excretion; Renin is an enzyme secreted by kidney JG cells.
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