A-LevelBiologyControl and coordinationOct/Nov 2020Paper 4 Q613 Marks
A person who has a wound to their skin may experience pain. Opioid drugs can be taken to relieve the pain. Opioid receptors are located in the presynaptic membrane of a cholinergic synapse. Fig. 6.1 shows the action of an opioid drug on the presynaptic membrane. [Figure 6.1]
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