During prolonged exercise, a person's blood glucose concentration falls below its optimum. Tests of the automatic control system give the following results.
| Test | Result |
|---|---|
| Receptor cells detect the fall in blood glucose concentration | Yes |
| The coordination centre receives and processes the information | Yes |
| A signal from the coordination centre reaches a gland | Yes |
| The gland releases a hormone | No |
Use the results to suggest which component of the control system has failed. Explain how this failure is likely to affect the person's blood glucose concentration.
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.