These are a diverse group of chemicals released into synaptic cleft, in response to a nerve impluse. Chemically, they can be proteins, biogenic amines, purines, neurohormones, nneuropeptides, etc. Most common necurotransmitters are Acetylcholine, Epinephrine or Nor-epinephrine. Endorphins are neuropeptides known for their :feel good: effect while Dopamine is active during emotional respones, addictive behavious and pleasurable experiences and help regulate muscle tone.
Some neurotransmitters are excitatory in nature, e.g., epinephrine, glutamate, asparatate; sometimes acetycholine, e.g., in neuromuscular junction while others are inhibitory, e.g., GABA (Gamma-Amino Butyric-Acid and glycine.
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