Thyroxine and adrenaline both increase the rate of chemical reactions in the body, but only thyroxine is controlled by negative feedback.
Name the gland that releases thyroxine and the gland that releases adrenaline.
Explain why the concentration of thyroxine in the blood is kept at a steady level, but the concentration of adrenaline is not.
39 exam-style questions on AQA GCSE Biology 5.3 Hormonal coordination in humans, covering 5.3.1 Human endocrine system, 5.3.2 Control of blood glucose concentration, 5.3.3 Maintaining water and nitrogen balance in the body, 5.3.4 Hormones in human reproduction, 5.3.5 Contraception, 5.3.6 The use of hormones to treat infertility (HT only), and 5.3.7 Negative feedback (HT only). Each one has a worked solution and a mark scheme showing where the marks go.