During a dry-environment test, three components of a person's automatic control system are monitored. Component P becomes active when the water level in the body changes. Component Q receives information from P and processes it. Component R is a gland that releases a hormone after receiving a signal from Q.
Which statement about components P, Q and R is correct?
Component P is a receptor because it detects the change in water level
Component Q is a receptor because it receives information from component P
Component R is a coordination centre because it releases a hormone
Component P is an effector because it responds before components Q and R
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.