A child produces too little thyroxine over a long period. Which pair of processes is most directly affected?
Blood clotting and antibody production.
Gamete fusion and chromosome replication.
Basal metabolic rate and normal development.
Ventilation rate and urine filtration.
62 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.