An athlete starts exercising in a room where the air temperature remains constant. Their core body temperature begins to rise.
Which statement explains the rise?
Exercise causes an external change because sweat reaches the skin surface.
Exercise causes an internal change because increased muscle respiration releases heat.
Exercise causes an external change because the room temperature remains constant.
Exercise causes an internal change because increased sweat evaporation releases heat.
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.