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IB Biology SL D3.3.6 Thermoregulation Mechanisms Questions

Explain how vasodilation, sweating and hairs lying flat increase heat loss, while vasoconstriction, reduced sweating and shivering conserve or generate heat.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how vasodilation and sweating increase heat loss when body temperature rises.
  • Explain shivering and metabolic heat production during cold conditions.

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Study D3.3.6—Thermoregulation mechanisms conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology SL D3.3.6 Thermoregulation Mechanisms Questions question 1

[Maximum number: 1]

These results were obtained by measuring the body temperature of people exercising on a hot and humid day.

Figure for Question IB Biology SL D3.3.6 Thermoregulation Mechanisms Questions question 1 — IB Biology SL

What mechanism could result in the changes seen during rest periods?

A

Shivering

B

Uncoupled respiration in brown adipose tissue

C

Vasodilation in the skin

D

Hair erection

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