During a safety inspection, a forestry worker sees a large branch begin to fall nearby. The worker has not started to move when the second set of measurements is taken.
| Measurement | Before seeing the branch fall | After seeing the branch fall |
|---|---|---|
| Heart rate in beats per minute | 75 | 120 |
| Blood glucose concentration in mmol per litre | 4.5 | 5.4 |
Calculate how many times as large the percentage increase in heart rate is as the percentage increase in blood glucose concentration.
Explain how the two changes shown in the table help the worker's muscles respond rapidly.
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.