Which sequence correctly represents an automatic control system restoring an optimum level?
Response → receptor → effector → coordination centre → stimulus
Response → coordination centre → receptor → stimulus → effector
Stimulus → receptor → coordination centre → effector → response
Stimulus → effector → coordination centre → receptor → response
40 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.