Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 27 of 99
In humans, the vast majority of synthesized urea, \(\text{(NH}_2\text{)}_2\text{CO}\), is eliminated from the body via:
A
Sweat
B
Saliva
C
Urine
D
Feces
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Urine
Concept: Primary nitrogenous excretion pathways.

Solution: Urea is filtered at the renal glomeruli and concentrated in urine, which accounts for over 90% of total nitrogenous waste clearance.

Why other options are incorrect:
  • Option A & Option B: Sweat and saliva contain trace concentrations of urea, but account for a negligible percentage of total excretion.

  • Option D: Feces eliminate unabsorbed digestive wastes, not metabolic urea.

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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