Notes in I. Histamine

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Published	10/21/2024	What enzyme is responsible for the synthesis of histamine from histidine?A. Histidine kinaseB. Histidine dehydrogenaseC. Histidine decarboxylaseD. His…
Published	10/21/2024	What type of cells, found in tissues like the lungs, skin, and blood vessels, store and release histamine during allergic reactions and anaphylaxis?
Published	10/21/2024	Which histamine receptor subtype is predominantly found in the gastric mucosa, cardiac muscle, mast cells, and brain?A. H1B. H2C. H3D. H4
Published	10/21/2024	3 major functions of histamine in the body.1. {{c1::Mediates allergic and inflammatory reactions}} 2. {{c1::Promotes gastric acid secretion…
Published	10/21/2024	LOCATION of Histamine● Present in practically all tissues, with significant amounts in the {{c1::lungs, skin, blood vessels, and GI tract}}● Foun…
Published	10/21/2024	Histamine promotes the vasodilation of small blood vessels by releasing {{c1::nitric oxide}} from the vascular endothelium.
Published	10/21/2024	Postreceptor mechanisms of the H2, H3, and H4 histamine receptors.
Published	10/21/2024	Which histamine receptor subtype is involved in decreasing cAMP levels and is distributed in eosinophils, neutrophils, and CD4 T cells?
Published	10/21/2024	The histamine receptor subtype H1, which is distributed in smooth muscle, endothelium, and brain, activates the Gq signaling pathway, leading to {{c1:…
Published	10/21/2024	What effect does histamine have on intestinal smooth muscle via H1 receptors?A. Relaxation, resulting in constipationB. Constriction, resulting in cra…
Published	10/21/2024	What type of receptors (H1 or H2) are involved in lowering systemic blood pressure by reducing peripheral resistance?
Published	10/21/2024	Histamine acting on H1 receptors in the bronchi causes constriction, leading to symptoms of {{c1::asthma}} and decreased lung capacity.
Published	10/21/2024	Actions of histamine on H1 receptors in the bodyIncreased production of {{c1::nasal and bronchial mucus}}, causing respiratory symptoms{{c1::Constrict…
Published	10/21/2024	Histamine acting on {{c1::H2}} receptors stimulates the secretion of gastric hydrochloric acid in the stomach.
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