Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 78 of 99
The involuntary contraction of cutaneous arrector pili muscles resulting in goosebumps is triggered when the human body is:
A
Overcooled
B
Overheated
C
Dehydrated
D
In a state of hypercapnia
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Overcooled
Concept: Thermoregulatory piloerection.

Solution: When the body is overcooled, sympathetic nerves trigger arrector pili muscles to contract, erecting hair follicles (piloerection / goosebumps) to trap an insulating layer of still air next to the skin.

Why other options are incorrect:
  • Option B: When overheated, arrector pili muscles relax so hair lies flat to allow heat dissipation.

  • Option C & Option D: Dehydration and hypercapnia trigger osmotic and respiratory compensations, not piloerection.

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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