During sustained flight, a bird's blood glucose concentration falls. Some cells detect this fall and send information to the bird's brain. The brain sends signals to a gland, which releases a hormone. The blood glucose concentration then rises back towards its optimum. Which statement about this control system is correct?
The cells that detect the fall are the coordination centre.
The gland that releases the hormone is the effector.
The brain that sends the signals is the effector.
The fall in blood glucose concentration is the response.
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.