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glossary:histamine [2007/09/23 13:11]
glossary:histamine [2012/10/16 14:40] (current)
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|+||Substance that plays a major role in many allergic reactions. Histamine dilates [[blood vessels]] and makes the vessel walls abnormally permeable. |
|+||(Science: biochemistry) formed by decarboxylation of histidine. potent pharmacological agent acting through receptors in smooth muscle and in secretory systems. |
|+||Stored in [[mast cell]]s and released by [[antigen]]. (see hypersensitivity). Responsible for the early symptoms of anaphylaxis. also present in some venoms. amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the humane [[immune system]] during allergic reactions.A chemical that is produced particularly by [[leukocyte]]s that results in blood vessels becoming more permeable and in turn lose fluid to the tissues. this can result in localised [[swelling]], and is a direct response to the presence of an [[antigen]]. |