neurotransmitter


neu·ro·trans·mit·ter

noun \-tran(t)s-ˈmi-tər, -tranz-\

medical : a substance in the body that carries a signal from one nerve cell to another

Full Definition of NEUROTRANSMITTER

:  a substance (as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse

First Known Use of NEUROTRANSMITTER

1961

neu·ro·trans·mit·ter

noun \ˌn(y)r-ō-tran(t)s-ˈmit-ər, -tranz-\   (Medical Dictionary)

Medical Definition of NEUROTRANSMITTER

: a substance (as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse—see false neurotransmitter

neurotransmitter

noun    (Concise Encyclopedia)

Chemical released by neurons to stimulate neighbouring neurons, allowing impulses to be passed from one cell to the next throughout the nervous system. A nerve impulse arriving at the axon terminal of one neuron stimulates release of a neurotransmitter, which crosses the microscopic gap (see synapse) in milliseconds to the adjoining neuron's dendrite. Many chemicals are believed to act as neurotransmitters. The few that have been identified include acetylcholine, dopamine, and serotonin. Some neurotransmitters activate neurons; others inhibit them. Some mind-altering drugs act by changing synaptic activity.

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