A horticultural worker spends 10 minutes in a tropical glasshouse. Sweat continues to evaporate from the worker's skin.
| Measurement over the 10 minutes | Value |
|---|---|
| air temperature | 39 ∘C39\ ^\circ\mathrm{C}39 ∘C |
| initial skin temperature | 34 ∘C34\ ^\circ\mathrm{C}34 ∘C |
| energy transferred between the air and the skin | 8.0 kJ |
| energy needed to evaporate the sweat | 12.0 kJ |
Assume these are the only energy transfers affecting the skin.
Explain whether the worker's skin temperature is likely to rise or fall during the 10 minutes.
78 exam-style questions on Edexcel GCSE Biology 7.3 Homeostasis and thermoregulation, covering 7.3.1 Importance of a constant internal environment, 7.3.2 Importance of homeostasis, 7.3.3a Thermoregulation via the skin and hypothalamus, and 7.3.3b Vasoconstriction and vasodilation in thermoregulation. Each one has a worked solution and a mark scheme showing where the marks go.