Fig. 8.1 illustrates a synapse between a sensory neurone and a relay neurone. The sensory neurone takes in information from a pain receptor. Fig. 8.2 shows the shape of some analgesic drug molecules.
(a)[6]
Explain how impulses in the sensory neurone stimulate the relay neurone.
(b)[4]
Analgesics are drugs that reduce or prevent the sensation of pain. Fig. 8.2 shows the shape of some analgesic drug molecules. Suggest how this analgesic drug can help to stop a person from feeling pain. Use information from Fig. 8.1 and Fig. 8.2 in your answer.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “the use of neurotransmitter molecules” …