Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 7 of 99
Which row in the table below correctly describes the physiological responses involved in human thermoregulation during exposure to hot temperatures?

Option Blood vessels in the surface of skin Sweat production
A constrict decreases
B constrict increases
C dilate decreases
D dilate increases
A
Vasodilation of cutaneous arterioles and increased sweating
B
Vasoconstriction of skin vessels and decreased sweating
C
Vasodilation with shivering thermogenesis
D
Vasoconstriction with erection of hair follicles
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Vasodilation of cutaneous arterioles and increased sweating
Concept: Physiological mechanisms of heat dissipation.

Solution: To lower core body temperature during heat exposure, cutaneous blood vessels undergo vasodilation to increase blood flow to the skin for radiant heat loss, while sweat glands increase sweat production for evaporative cooling.

Why other options are incorrect:
  • Option B & Option D: Vasoconstriction and piloerection (hair erection) are responses to cold stress designed to conserve heat.

  • Option C: Shivering generates metabolic heat and occurs during cold exposure, not hot exposure.

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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