[his-tuh-meen, -min] /ˈhɪs təˌmin, -mɪn/
Biochemistry, Physiology. a heterocyclic amine, C 5 H 9 N 3 , released by mast cells when tissue is injured or in allergic and inflammatory reactions, causing dilation of small blood vessels and smooth muscle contraction.
Pharmacology. a commercial form of this compound, obtained from and used chiefly in the diagnosis of gastric and circulatory functions.
an amine formed from histidine and released by the body tissues in allergic reactions, causing irritation. It also stimulates gastric secretions, dilates blood vessels, and contracts smooth muscle. Formula: C5H9N3 See also antihistamine
1913, “amine produced by the decomposition of histidine.”
histamine his·ta·mine (hĭs’tə-mēn’, -mĭn)
A physiologically active depressor amine found in plant and animal tissue, derived from histidine by decarboxylation and released from cells in the immune system as part of an allergic reaction. It is a powerful stimulant of gastric secretion, constrictor of bronchial smooth muscle, and vasodilator.
his’ta·min’ic (-mĭn’ĭk) adj.
An organic compound found widely in animals and plants that in humans and other mammals is released as part of the body’s immune response, causing physiological changes including dilation of the blood vessels, contraction of smooth muscle (as in the airways), and increased gastric acid secretion. The itching and sneezing typical of respiratory allergies are caused by the release of histamine. Chemical formula: C5H9N3
[hi-stam-uh-neys, -neyz] /hɪˈstæm əˌneɪs, -ˌneɪz/ noun, Biochemistry, Pharmacology. 1. an enzyme that catalyzes the decomposition of , used in treating allergies. /hɪˈstæmɪˌneɪs/ noun 1. an enzyme, occurring in the digestive system, that inactivates histamine by removal of its amino group Also called diamine oxidase histaminase his·tam·i·nase (hĭ-stām’ə-nās’, -nāz’, hĭs’tə-mə-) n. An enzyme that inactivates histamine […]
[his-tuh-meen, -min] /ˈhɪs təˌmin, -mɪn/ noun 1. Biochemistry, Physiology. a heterocyclic amine, C 5 H 9 N 3 , released by mast cells when tissue is injured or in allergic and inflammatory reactions, causing dilation of small blood vessels and smooth muscle contraction. 2. Pharmacology. a commercial form of this compound, obtained from and used […]
noun, Pharmacology. 1. any of various substances that act at a specific receptor site to block certain actions of histamine.
histamine-fast his·ta·mine-fast (hĭs’tə-mēn-fāst’, -mĭn-) adj. Of or relating to the absence of the normal response to histamine, especially regarding gastric anacidity.