Describe the structure of a nervous system synapse. What happens when an action potential reaches the synapse? Explain with suitable diagrams.

A synapse is the junction between two neurons or between a neuron and a target cell, such as a muscle or gland. It consists of three main parts: the presynaptic terminal, synaptic cleft, and postsynaptic membrane. The presynaptic terminal contains synaptic _____ _____ ________ ____ _____ ___ ____ _________.
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