Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 77 of 99
Which human organs weigh less than 1% of total body weight yet receive approximately 20% to 25% of total cardiac output?
A
Heart
B
Kidneys
C
Lungs
D
Brain
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Kidneys
Concept: Renal blood flow kinetics.

Solution: The two kidneys weigh roughly 300 grams combined (<1% of body weight) but receive ~1.2 L/min of blood (~20-25% of resting cardiac output) to maintain high rates of glomerular filtration.

Why other options are incorrect:
  • Option A: The heart receives ~5% of cardiac output via coronary arteries.

  • Option C: The lungs receive the entire right ventricular output via pulmonary circulation, but their metabolic tissue supply via bronchial arteries is small.

  • Option D: The brain receives ~15% of cardiac output and weighs ~2% of total body mass.

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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