Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 96 of 99
Severe frostbite occurs under extreme cold exposure when peripheral cutaneous blood vessels undergo intense:
A
Vasoconstriction
B
Vasodilation
C
Muscular hypertrophy
D
Endothelial sloughing
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Vasoconstriction
Concept: Pathophysiology of frostbite.

Solution: Extreme cold triggers massive sympathetic vasoconstriction of skin arterioles to conserve core body heat. Severe, prolonged reduction in local peripheral blood flow leads to tissue ischemia, freezing, and frostbite.

Why other options are incorrect:
  • Option B (Vasodilation): Increases warm blood flow to the skin, preventing cold injury.

  • Option C & Option D: Structural cellular changes that do not trigger acute vascular cold injury.

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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