Sleep plays a vital role in good health and well-being throughout your life. Getting enough quality sleep at the right times can help protect your mental health, physical health, quality of life, and safety. The way you feel while you're awake depends in part on what happens while you're sleeping.
Receptors for the various neurotransmitters are located on both the presynaptic and postsynaptic nerve terminals of the neuron.
The synapse is located at the end of each axonal end branch. Here the end branch forms a small button-like knob, referred to as the synaptic knob. This knob is adjacent to a tiny cleft or synapse. When a nerve impulse reaches this knob, a drug called a neurotransmitter is released from vesicles into the synapse. The neurotransmitter diffuses across the gap and binds to receptors on the membrane of the adjacent neuron or muscle cell.