Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 67 of 99
Which specific hair-pin loop structure within the renal medulla functions as a countercurrent multiplier?
A
Loop of Henle
B
Proximal tubule
C
Distal tubule
D
Renal pelvis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Loop of Henle
Concept: Renal countercurrent multiplier.

Solution: The Loop of Henle acts as a countercurrent multiplier; opposing fluid flow and active salt pumping in the ascending limb create a longitudinal medullary hyperosmotic gradient.

Why other options are incorrect:
  • Option B & Option C: Convoluted tubules in the cortex do not establish the longitudinal medullary osmotic gradient.

  • Option D: The renal pelvis collects urine for excretion into the ureter.

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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