A hiker sees a large branch falling towards the path and moves away quickly. A monitor records two sets of measurements, P and Q, but the labels showing when each set was recorded are missing.
| Measurement | Set P | Set Q |
|---|---|---|
| Heart rate (beats per minute) | 74 | 121 |
| Blood glucose concentration (mmol/dm³) | 5.0 | 6.4 |
| Blood flow to the leg muscles (dm³ per minute) | 0.8 | 2.6 |
Explain which set of measurements was most likely recorded after adrenaline was released and how the changes shown would help the hiker move away quickly.
89 exam-style questions on Edexcel GCSE Biology 7.1 Hormones and coordination, covering 7.1.1 Endocrine glands and hormone transport, 7.1.2 Adrenalin and fight or flight, and 7.1.3 Thyroxine and negative feedback. Each one has a worked solution and a mark scheme showing where the marks go.