A patient takes a medication that acts as a potent thyroxine receptor agonist, effectively mimicking high levels of circulating thyroxine in the body. What effect will this medication have on the endogenous levels of thyroid-stimulating hormone (TSH) and thyrotropin-releasing hormone (TRH)?
Both decrease
Both increase
Both remain unchanged
TSH decreases and TRH increases
23 exam-style questions on OCR GCSE Biology 3.2 Coordination and control – the endocrine system, covering 3.2.1 Principles of hormonal coordination and control, 3.2.2 Roles of thyroxine and adrenaline, 3.2.3 Hormones in human reproduction, 3.2.4 Interactions of reproductive hormones, 3.2.5 Hormones in contraception, 3.2.6 Hormones in reproductive technologies, 3.2.7 Plant hormones in growth and coordination, 3.2.8 Effects of plant hormones, and 3.2.9 Uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.