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Neurotransmitters
We know that transmission of signals from nerves to muscles is affected by acetylcholine a transmitter substance. Similarly neuron-neuron transmission is also achieved by acetylcholine. But there are several other chemicals that function as neurotransmitters. A limited number has already been identified and new ones are being identified rapidly.
A chemical can be called a neurotransmitter in a given tissue only if it fulfils certain conditions like:
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