After several minutes working in a warm greenhouse, Leila's core body temperature rises above its normal range and her skin looks red. The air and surrounding surfaces in the greenhouse remain cooler than her skin.
Suggest the response of the arterioles supplying the skin capillaries.
Suggest why Leila's skin looks red.
Explain how the change in blood flow helps to lower Leila's core body temperature.
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.