Hormones are carried in the blood to all parts of the body. Each hormone only affects certain organs, called target organs. Which statement explains why a hormone only affects its target organs?
The hormone is only carried in blood vessels that lead to target organs.
The hormone is broken down before it can reach any of the other organs.
Target organs are the only organs found close to the endocrine gland.
Only the cells of target organs have receptors for that hormone.
84 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.