A firefighter is working inside a burning building. The air temperature is 60 ∘C60\ ^{\circ}\text{C}60 ∘C. The firefighter is carrying heavy equipment.
Give one external change and one internal change that could cause the firefighter's body temperature to rise.
The firefighter wears protective clothing that does not let water vapour pass through it.
Explain why the firefighter's body temperature may rise even though they are sweating a lot.
The firefighter drinks water during breaks.
Explain how sweating a lot without drinking water could affect body cells.
44 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.