| vasoactive amine | A substance, such as histamine or serotonin, that contains amino groups and is pharmacologically characterised by its action on the blood vessels (altering vascular caliber or permeability). (05 Mar 2000) |
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| vasoactive intestinal contractor | Mouse homologue of endothelin 2. (18 Nov 1997) |
| vasoactive intestinal peptide | <gastroenterology, protein> Peptide of 28 amino acids, originally isolated from porcine intestine, but later found in the central nervous system where it acts as a neuropeptide and is released by specific interneurons. May also affect behaviour of cells of the immune system. Acronym: VIP (05 Jan 1998) |
| vasoactive intestinal polypeptide | A polypeptide hormone secreted most commonly by non-beta islet cell tumours of the pancreas, producing copious watery diarrhoea and faecal electrolyte loss, particularly hypokalaemia; VIP increases the rates of glycogenolysis; stimulates pancreatic bicarbonate secretion. Synonym: vasoactive intestinal peptide. (05 Mar 2000) |
| vasoconstriction | The diminution of the calibre of vessels, especially constriction of arterioles leading to decreased blood flow to a part. (18 Nov 1997) |
| vasoconstrictive | 1. Causing narrowing of the blood vessels. Synonym: vasoconstrictor. (05 Mar 2000) |
| vasoconstrictor | Something which causes vasoconstriction, or the narrowing of blood vessels so that less blood is able to flow through at a time. This can either be a chemical substance or a nerve. (09 Oct 1997) |
| vasoconstrictor agents | Drugs used to cause constriction of the blood vessels. (12 Dec 1998) |
| vasodentin | Dentin in which the primitive capillaries have remained uncalcified and so are wide enough to give passage to the formed elements of the blood. Synonym: vascular dentin. (05 Mar 2000) |
| vasodentine | <anatomy> A modified form of dentine, which is permeated by blood capillaries; vascular dentine. Origin: L. Vas a vessel + E. Dentine. Source: Websters Dictionary (01 Mar 1998) |
| vasodepression | Reduction of tone in blood vessels with vasodilation and resulting lowered blood pressure. (05 Mar 2000) |
| vasodepressor | 1. Producing vasodepression. 2. An agent that produces vasodepression. (05 Mar 2000) |
| vasodepressor substance | An incompletely characterised chemical, apparently produced during liver damage, that tends to decrease vascular pressures and relax arterial walls. (05 Mar 2000) |
| vasodepressor syncope | Faintness or loss of consciousness due to reflex reduction in blood pressure. Synonym: vasovagal syncope. (05 Mar 2000) |
| vasodilatation | A state of increased calibre of the blood vessels. (18 Nov 1997) |