IB Biology SL 3.3.5 Thermoregulation
Practise explaining human thermoregulation, from hypothalamic detection to sweating, shivering and negative-feedback responses.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain hypothalamic detection and negative feedback in human temperature control.
- Relate sweating, shivering and blood-flow changes to heat loss or heat gain.
D3.3.5—Thermoregulation question 1
[Maximum number: 6]
Describe how body temperature is maintained in humans.
a. maintained close to 36.7/37∘C/98.6∘F;
b. heat is transferred/distributed in body by blood;
c. hypothalamus contains thermoreceptors;
d. hypothalamus monitors temperature/sends message to effectors/causes response;
e. (vaso) dilation of skin arterioles warms skin/cools body;
f. (vaso) constriction of skin arterioles retains body heat;
g. skin/sweat glands produce sweat to cool the body when overheated;
h. removal of heat through evaporation of sweat;
i. shivering generates heat / increased metabolism / hair erection to retain heat; j. example of behavioural change to warm/cool the body to thermoregulate;
All question bank results loaded