Two people cycle at the same steady rate for 20 minutes. Person A has a normally functioning blood glucose control system. Person B has a fault in one part of the control system.
The table shows measurements taken at the start and after 20 minutes of cycling.
| Person | Time | Signals from receptors per minute | Signals from coordination centre per minute | Hormone released by gland in 5 minutes / µg | Blood glucose concentration / mmol per dm³ |
|---|---|---|---|---|---|
| A | Start | 3 | 3 | 4 | 5.0 |
| A | After 20 minutes | 12 | 11 | 13 | 4.8 |
| B | Start | 3 | 3 | 4 | 5.0 |
| B | After 20 minutes | 12 | 11 | 4 | 3.6 |
Explain which part of person B's control system is faulty. Use the data in the table.
Predict how person B's blood glucose concentration will change if person B continues cycling at the same rate for another 20 minutes. Explain your answer.
76 exam-style questions on AQA GCSE Biology 5.1 Homeostasis, covering 5.1 Homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.