Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 61 of 99
In the human nephron, approximately 65% to 80% of all filtered water, electrolytes, and organic nutrients are reabsorbed in the:
A
Proximal convoluted tubule
B
Distal convoluted tubule
C
Ascending limb of Henle
D
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 A: Proximal convoluted tubule
Concept: Bulk reabsorption in the PCT.

Solution: The proximal convoluted tubule (PCT) possesses microvilli (brush border) and dense mitochondria, reabsorbing ~65–80% of filtered water/solutes and 100% of glucose and amino acids.

Why other options are incorrect:
  • Option B & Option D: Reabsorb smaller, highly regulated percentages of remaining water and ions.

  • Option C: Reabsorbs ~25% of filtered salts, but no water.

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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