A musician is sitting still while waiting for an audition. The musician becomes stressed, causing adrenaline to be released.
| Condition | Heart rate in beats per minute |
|---|---|
| Before becoming stressed | 72 |
| While stressed | 117 |
Calculate the percentage increase in the musician's heart rate while stressed.
Explain how the increase in heart rate prepares the musician's muscle cells for rapid action.
85 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.