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What are neurontransmitters?

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Anonymous

 ∙ 13y ago
Updated: 11/13/2022

a chemical that transmits a nervous systems signal across a synapse.

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Wiki User

 ∙ 13y ago

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Where are neurontransmitters located?

There are two answers, depending on whether you use the older, more restricted definition of neurotransmitter that focuses on the transmitter origin vs. a more modern, lenient definition based on the transmitter effect. In the former, a neurotransmitter is an ion, molecule or protein produced, modified, and packaged for secretion by any cell that can influence neurons via its release. The area released is called the synaptic cleft (tight spaces between transmitting cells and their target cells). Hence the answer is that the transmitters are located in the source and target cells and the cleft. A small fraction leaks out of the cleft and is destroyed by neighboring cells. The better answer is that ions such as heavy metals and even gases such as nitric oxide are now known to have similar effects on neurons as "classic neurotransmitters". Hence a "neurotransmitter" that can modulate neurons can be located nearly anywhere and is a little fuzzy, based on how much it needs to be modified first. E.g. zinc in vitamins and CO in the air are pretty close to direct, but the active ingredient of Viagra, which upregulates NO (a neurotransmitter) indirectly, wouldn't be considered a neurotransmitter. I hope this was both interesting and helpful!

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