Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 69 of 99
Antidiuretic hormone (ADH) regulates renal physiology by specifically increasing the tubular reabsorption of:
A
Water
B
Amino acids
C
Sodium chloride
D
Ammonia
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Water
Concept: Selective action of ADH.

Solution: ADH acts selectively on principal cells of late distal tubules and collecting ducts to insert aquaporin-2 water channels, driving free water reabsorption into the hypertonic medullary interstitium.

Why other options are incorrect:
  • Option B: Amino acids are 100% reabsorbed in the PCT via sodium cotransporters, independent of ADH.

  • Option C (Sodium chloride): Sodium reabsorption is regulated primarily by aldosterone, not ADH.

  • Option D: Ammonia is secreted into the lumen to regulate acid-base balance.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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