Vasoconstriction

Vasoconstriction
Narrowing of the blood vessels resulting from contracting of the muscular wall of the vessels. The opposite of vasodilation.
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Narrowing of the blood vessel s.
- active v. reduced caliber of a vessel caused by increased tonus in the smooth muscle in its walls.
- passive v. reduced caliber of a vessel caused by decreased intraluminal pressure.

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va·so·con·stric·tion -kən-'strik-shən n narrowing of the lumen of blood vessels esp. as a result of vasomotor action

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n.
a decrease in the diameter of blood vessels, especially arteries. This results from activation of the vasomotor centre in the brain, which brings about contraction of the muscular walls of the arteries and hence an increase in blood pressure.

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vaso·con·stric·tion (va″zo-) (vas″o-kən-strikґshən) the diminution of the caliber of vessels, especially constriction of arterioles leading to decreased blood flow to a part. vasoconstrictive adj

Medical dictionary. 2011.

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Look at other dictionaries:

  • Vasoconstriction — is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, particularly the large arteries, small arterioles and veins. The process is the opposite of vasodilation, the widening of blood vessels. The… …   Wikipedia

  • vasoconstriction — 1899, from comb. form of VAS (Cf. vas) + CONSTRICTION (Cf. constriction) …   Etymology dictionary

  • vasoconstriction — vasoconstricteur [ vazokɔ̃striktɶr ] adj. m. et n. m. • 1859; de vaso et constricteur ♦ Physiol., méd. Qui diminue le calibre d un vaisseau par contraction de ses fibres musculaires (en déterminant la vasoconstriction). Nerf vasoconstricteur.… …   Encyclopédie Universelle

  • Vasoconstriction — La vasoconstriction est un mécanisme physiologique correspondant à la diminution du calibre des vaisseaux sanguins. Elle intervient normalement en réponse immédiate à la lésion d un vaisseau pour en arrêter le saignement. C est la première étape… …   Wikipédia en Français

  • Vasoconstriction des vaisseaux peripheriques — Vasoconstriction des vaisseaux périphériques Les β bloquants induisant une relaxation cardiaque, il faut absolument maintenir la pression artérielle sanguine. C est un mécanisme de régulation naturelle du corps. De ce fait si le cœur se relaxe,… …   Wikipédia en Français

  • vasoconstriction — noun Etymology: International Scientific Vocabulary Date: 1899 narrowing of the lumen of blood vessels …   New Collegiate Dictionary

  • vasoconstriction — /vas oh keuhn strik sheuhn, vay zoh /, n. Physiol. constriction of the blood vessels, as by the action of a nerve. [1895 1900; VASO + CONSTRICTION] * * * …   Universalium

  • vasoconstriction — noun constriction of a blood vessel See Also: vasodilation, vasoconstrictive, vasoconstrictor …   Wiktionary

  • vasoconstriction — n. constriction of blood vessels …   English contemporary dictionary

  • vasoconstriction — noun the constriction of blood vessels, which increases blood pressure. Derivatives vasoconstrictive adjective vasoconstrictor noun …   English new terms dictionary

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