histamine definition

  • noun:
    • A physiologically energetic amine, C5H9N3, present in plant and animal structure and circulated from mast cells as part of an allergic effect in people. It stimulates gastric release and results in dilation of capillary vessel, constriction of bronchial smooth muscle, and reduced blood circulation pressure.
    • An amine, C5H9N3, created by decarboxylation of histidine, that triggers dilatation of capillary vessel, contraction of smooth muscle, and stimulation of gastric acid release; it is introduced during allergy symptoms.
    • amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions

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