Before exercise, a small mammal's blood glucose concentration is at its optimum level.
A scientist investigates three components, A, B and C, of the automatic control system for blood glucose concentration.
| Test | Result |
|---|---|
| The blood glucose concentration falls during exercise. | The activity of A changes before the activity of B or C. |
| Signals from A are prevented from reaching B. | C does not carry out a response. |
| B is stimulated directly. | C carries out a response and the blood glucose concentration moves towards its original level. |
Which statement best explains the results?
A is the receptor, B is the coordination centre and C is the effector; the response by C restores blood glucose concentration towards its optimum level.
A is the effector, B is the coordination centre and C is the receptor; the response by A restores blood glucose concentration towards its optimum level.
A is the coordination centre, B is the receptor and C is the effector; the response by C restores blood glucose concentration towards its optimum level.
A is the receptor, B is the effector and C is the coordination centre; the response by B restores blood glucose concentration towards its optimum level.
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.