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Neurotransmitters Definition
What Is A Neurotransmitter?

A chemical, such as acetylcholine, which is released from the axon of one neuron and binds to a specific site in the dendrite of an adjacent neuron, thus triggering a nerve impulse. Neurotransmitters are the chemicals that transmit information across the junction (synapse) that separates one nerve cell (neuron) from another nerve cell or a muscle. Neurotransmitters are stored in the nerve cell's bulbous end (axon). When an electrical impulse traveling along the nerve reaches the axon, the neurotransmitter is released and travels across the synapse, either prompting or inhibiting continued electrical impulses along the nerve. There are more than 300 known neurotransmitters, including chemicals such as acetylcholine, norepinephrine, adenosine triphosphate, and the endorphins, and gases, such as nitric oxide. Abnormalities in the production or functioning of certain neurotransmitters have been implicated in a number of diseases including Parkinson's disease, amyotrophic lateral sclerosis, etc.

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