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Open the document below and read the mandatory course notes provided by SQA for this Key Area. You may wish to use your home learning time to copy these notes into a jotter or choose a digital presentation format that suits your learning style.

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Many drugs used to treat neurotransmitter-related disorders are agonists or antagonists. Agonists are chemicals that bind to and stimulate specific receptors mimicking the action of a neurotransmitter at a synapse. An antagonist is a chemical that binds to specific receptors blocking the action of a neurotransmitter at a synapse.