Neurotransmitters

Neurotransmitters are chemical messengers that play a critical role in transmitting signals across synapses in the nervous system. These signals are transmitted between neurons or from neurons to muscles, glands, or other tissues. The process begins when an electrical signal, called an action potential, travels along the axon of a neuron to the synaptic terminal.

At the synaptic terminal, the action potential triggers the release of neurotransmitters from synaptic vesicles into the synaptic cleft (the small gap between two neurons). The neurotransmitters then bind ________ ___ ___ ____ _________ _____ _________.
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