Two volunteers take part in the same emergency-response training task. They hear an alarm and must pull a weighted handle as rapidly as possible.
The adrenal glands of one volunteer do not secrete adrenaline. Before the alarm, both volunteers have the same measurements.
The table shows their measurements immediately after the alarm.
| Measurement | Volunteer R | Volunteer S |
|---|---|---|
| heart rate in beats per minute | 126 | 78 |
| blood pressure in kPa | 17.8 | 15.4 |
| blood flow to arm muscles in dm³ per minute | 0.78 | 0.32 |
| blood glucose concentration in mmol per dm³ | 6.6 | 4.9 |
Use the data to explain which volunteer's adrenal glands do not secrete adrenaline and predict how this affects the volunteer's ability to pull the handle 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.