During a frightening event, adrenaline prepares the body for rapid action. Which change contributes most directly to increased respiration in muscle cells?
A reduced heart rate decreases the delivery of oxygen and glucose to muscles.
An increased heart rate increases the delivery of oxygen and glucose to muscles.
A reduced metabolic rate increases the storage of oxygen and glucose in muscles.
An increased urine output increases the delivery of oxygen and glucose to muscles.
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.