Final answer:
Synaptic vesicles are found in the synaptic terminals of a neuron, located at the end of an axon. When an action potential reaches the axon terminal, it triggers the release of neurotransmitters into the synaptic cleft.
Step-by-step explanation:
The synaptic vesicles are found in the synaptic terminals of a neuron. These synaptic terminals are located at the end of an axon and are responsible for transmitting signals to other neurons or target cells. When an action potential reaches the axon terminal, it triggers the fusion of the synaptic vesicles with the membrane, releasing neurotransmitters into the synaptic cleft.