A neurotransmitter is a chemical substance that carries signals from one nerve cell to another. neurotransmitters are released from the end of a nerve cell when it is stimulated by an electrical impulse. They then bind to receptors on the surface of another nerve cell, causing it to either fire or inhibit its own electrical impulse. neurotransmitters play a key role in regulating many functions of the nervous system, such as mood, memory, learning, and pain.

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