Hypothyroidism occurs when the body has an underactive thyroid gland.
Explain why people with hypothyroidism often experience fatigue and weight gain.
Hypothyroidism can lead to higher levels of lipids in the blood, which can build up as plaques in the coronary arteries. Suggest why a blockage in a coronary artery can affect the muscle cells of the heart.
In severe cases of hypothyroidism, a patient's core body temperature can drop below 35 ∘C35\text{ }^\circ\text{C}35 ∘C, leading to hypothermia. Explain why hypothermia is harmful to metabolic reactions in the body.
The population of a European country is 64 million. It is estimated that 2.5% of this population has hypothyroidism. Calculate how many million people in this country have hypothyroidism.
Thyroxine is one hormone involved in maintaining homeostasis. Name the hormone produced by the pancreas that lowers blood glucose levels when they are too high.
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.