Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 60 of 99
Under normal physiological conditions, the vast majority of filtered water and sodium ions are reabsorbed in the:
A
Urinary bladder and urethra
B
Ureter and renal pelvis
C
Adrenal cortex
D
Proximal Convoluted Tubule and Collecting Duct
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Proximal Convoluted Tubule and Collecting Duct
Concept: Sites of renal sodium and water reabsorption.

Solution: Over 65% of water and sodium is reabsorbed obligatorily in the proximal convoluted tubule (PCT), while fine-tuning of remaining water reabsorption occurs in the collecting duct under hormonal control.

Why other options are incorrect:
  • Option A & Option B: Storage and urinary conducting structures that exhibit no active reabsorption capacity.

  • Option C: The adrenal cortex is an endocrine gland secreting steroid hormones; it is not a nephron segment.

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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