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Histamine
Histamine is a monoamine neurotransmitter that is involved with the immune system. It triggers responses of inflammation or allergies.
It is responsible for dilating the blood vessels, lower blood pressure, constricting the airways, production of gastric acid, and for the sensation of itching.
Chemistry
Histamine is a monoamine, which is a amine group attached to a aromatic ring via an ethyl chain, in this case the aromatic ring is an imidazole ring. This monoamine chain can be found in many neurotransmitters, including dopamine, serotonin and noradrenaline. It's also found in many drugs, examples being tryptamines and phenethylamines.
See also
References
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