Scientists use a temperature-controlled vest to lower a volunteer's core body temperature slightly. They make several observations of the volunteer's body.
Which observation would show that the volunteer's body is generating more heat, rather than reducing heat loss?
Raised body hairs trap more still air next to the skin.
Fatty tissue beneath the skin reduces energy transfer to the cold vest.
Blood leaving the leg muscles becomes warmer once rapid, involuntary contractions begin.
Less blood flows through capillaries close to the skin surface.
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.