A person accidentally steps on a sharp object. In the automatic nervous response, receptors in the skin detect the stimulus, electrical impulses travel along neurones to and from the spinal cord, and a muscle in the leg contracts.
Which observation is the best evidence that the spinal cord is not working correctly?
The spinal cord receives electrical impulses but does not produce outgoing electrical impulses.
Electrical impulses from the receptors do not reach the spinal cord.
The receptors do not produce electrical impulses when the stimulus occurs.
Electrical impulses reach the leg muscle but the muscle does not contract.
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.