A person exercises hard on a hot day and drinks no water.
Describe and explain how the person's body responds to keep the concentration of the blood constant.
A patient with kidney failure is treated by dialysis three times each week. The patient is told to control the amount of protein and salt in their diet between dialysis sessions.
Explain why the patient must control their diet.
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.