A fox moves from a cool burrow into warmer surroundings. Measurements show that the rate of enzyme-controlled reactions in its cells changes very little. Why?
Its receptors cannot detect changes outside the body, so no response alters its enzyme activity.
Its enzymes work equally well at any temperature, so warmer surroundings have no effect on them.
Its control systems keep its internal temperature steady, so its enzymes keep working at their best.
Its internal temperature rises to match its surroundings, which is the best temperature for its enzymes.
76 exam-style questions on AQA GCSE Biology 5.1 Homeostasis, covering 5.1 Homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.