A researcher is investigating the automatic control of water levels in a mammal. When tested separately, the coordination centre and the gland that acts as the effector both work normally. When the water level in the mammal's body falls, no information reaches the coordination centre and the gland does not release its hormone. What is the most likely cause?
The coordination centre is not processing the information it receives.
The hormone is not carrying information to the coordination centre.
The receptor cells are not detecting the change.
The gland is not releasing its hormone when it is stimulated.
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.