Two people exercise at the same rate in a room cooler than their skin. Both have the same rate of heat production and the same rate of sweat evaporation.
Person P can dilate the arterioles supplying skin capillaries. Person Q cannot.
Which outcome is most likely?
Q transfers more heat to the skin, so Q's core temperature rises less.
P transfers more heat to the skin, so P's core temperature rises less.
Q transfers less heat to the skin, so Q's core temperature rises less.
P transfers less heat to the skin, so P's core temperature rises less.
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.