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OPRA Biomedical Sciences QUESTION #3804
Question 1
What is the primary physiological action of antidiuretic hormone (vasopressin) in the kidneys?
  • To increase blood pressure, increasing formation of nephric filtrate
  • To cause active transport of urea and uric acid from renal blood into tubules
  • To inhibit aldosterone action
  • To cause reabsorption of water✔️
Correct Answer Explanation
Vasopressin (ADH) acts on collecting duct principal cells to increase water permeability via aquaporin-2 channels, promoting water reabsorption and reducing urine volume.