A runner's core body temperature remains at 37.2 ∘C37.2\ ^\circ\mathrm{C}37.2 ∘C for several minutes despite continued exercise. The air is cooler than the skin, and sweating and vasodilation remain above resting levels.
Which statement best explains these observations?
Heat production has stopped, while increased heat loss keeps temperature constant.
Heat loss has stopped, while continued heat production keeps temperature constant.
Increased heat loss balances heat production, maintaining a stable core temperature.
Increased heat loss exceeds heat production, maintaining a stable core temperature.
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.