Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 9 of 99
Active reabsorption of \(\text{Na}^+\) ions in the thick ascending limb and distal nephron segments is promoted by:
A
Thyroxine
B
Antidiuretic hormone (ADH)
C
Cortisone
D
Aldosterone
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Aldosterone
Concept: Hormonal regulation of renal sodium transport.

Solution: Aldosterone upregulates \(\text{Na}^+/\text{K}^+\)-ATPase pumps and sodium channels, enhancing active sodium reabsorption across the thick ascending limb, distal tubule, and collecting duct.

Why other options are incorrect:
  • Option A: Thyroxine regulates overall basal metabolic rate.

  • Option B: ADH increases water permeability by inserting aquaporin channels.

  • Option C: Cortisone is a glucocorticoid involved in glucose metabolism and inflammation control.

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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