The following sample is for the question: Explain the role of one agonist with reference to one study. There are two ways to answer this question. Neurotransmitters are endogenous agonists - that is, they bind with receptor sites on the post-synaptic neuron and cause an action potential. Drugs are exogenous agonists. They act in the same way, but they are not natural in our nervous system.The sample below is an exemplary...