IB Biology HL 3.3.6 Thermoregulation Mechanisms
Practise analysing HL thermoregulation mechanisms, including brown adipose tissue, exercise data and coordinated heat-loss responses.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse coordinated vasomotor, sweating and muscle responses to changing body temperature.
- Interpret exercise and imaging data to explain metabolic heat production and heat loss.
- Compare heat-gain and heat-loss mechanisms in mammalian thermoregulation.
D3.3.6—Thermoregulation mechanisms question 1
[Maximum number: 1]
Average human internal (core) body temperature is 36.4∘C, with slight variations between day and night. The average surface temperature of the Earth in the 20th century was 13.9∘C. It has now risen to 14.8∘C.
Outline one change that happens in the human body in response to a rise in body temperature above 36.4∘C.
a. sweating/sweat secretion;
b. vasodilation / skin arterioles widen / increased blood flow to skin;
c. shunt vessels in the skin close;
b. Do not accept' blood
vessels widen' unless the answer indicates that more blood will flow to the skin.
1 max
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