vasoconstriction


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vasoconstriction

 [vas″o-kon-strik´shun]
decrease in the caliber of blood vessels. adj., adj vasoconstric´tive.

va·so·con·stric·tion

(vā'sō-kon-strik'shŭn, vas'ō-),
Narrowing of the blood vessels.

vasoconstriction

/vaso·con·stric·tion/ (-kon-strik´shun) decrease in the caliber of blood vessels.vasoconstric´tive

vasoconstriction

(vā′zō-kən-strĭk′shən)
n.
Constriction of a blood vessel, as by a nerve or drug.

vas′o·con·stric′tive adj.

vasoconstriction

Etymology: L, vas + constrigere, to tighten
a decrease in the diameter of a blood vessel. It plays an important role in the control of blood pressure and the distribution of blood throughout the body. Vasoconstriction is triggered by stimulation of the vasomotor constriction center in the medulla. Impulses from this center travel along sympathetic nerve fibers and cause contraction of the smooth muscle layers of arteries, arterioles, and, to a lesser extent, venules, and veins, bringing about constriction of these vessels. Vasoconstriction is also induced by vasomotor pressure reflexes, chemical reflexes, the medullary ischemic reflex, and impulses from the cerebral cortex and the hypothalamus. Compare vasodilation. vasoconstrictive, adj.

va·so·con·stric·tion

(vā'sō-kŏn-strik'shŭn)
Reduction in the caliber of a blood vessel due to contraction of smooth muscle fibers in the tunica media leading to decreased blood flow to a part.

vasoconstriction

Active narrowing of small arteries as a result of contraction of the circular smooth muscle fibres in their walls. This severely reduces the flow of blood through them. Compare VASODILATATION.

vasoconstriction

a narrowing of the blood vessels, often in response to cold, which occurs through a contraction of INVOLUNTARY muscles in the walls of the vessels brought about by a stimulus from the sympathetic nervous system (see AUTONOMIC NERVOUS SYSTEM).

Vasoconstriction

Constriction of a blood vessel.
Mentioned in: Induction of Labor

vasoconstriction

narrowing of the lumen of a blood vessel, due to contraction of the smooth muscle in its wall, mediated by neural (autonomic) control, local or blood-borne chemical factors, or fall in temperature. Part of the rationale for the use of ice in acute injury to minimize blood flow (and therefore swelling) in the damaged tissue.

vasoconstriction (vāˈ·zō·kn·strikˑ·shn),

n state of constriction or narrowing of a blood vessel.

va·so·con·stric·tion

(vā'sō-kŏn-strik'shŭn)
Narrowing of blood vessels.

vasoconstriction

decrease in the caliber of blood vessels; may be general or local, e.g. pulmonary, peripheral.
References in periodicals archive ?
Quercetin protects against diabetes-induced exaggerated vasoconstriction in rats: effect on low grade inflammation.
Correspondingly, an article providing an historical perspective reports vasoconstriction of arteries following application of high-concentration oxygen can lead to decreased cardiac output, stroke volume and may be linked to reduced cerebral and renal blood flow.
18) It is suggested that serious vasoconstriction can contribute to additional renal injury by the release of ROS.
In clinical testing, the new "blood," called HemoTech, did not show the vasoconstriction and inflammatory toxicities that have hampered other substitutes.
Eril prevents blood vessels from constricting with a new mechanism that inhibits the protein kinase, which is the last step in the vasoconstriction process.
The cause of pulmonary hypertension is hypoxic pulmonary vasoconstriction.
If the hypothalamus concludes that you're cold, it instructs your body to start a process called peripheral vasoconstriction (puh-RIF-uh-ruhl VASE-oh-con-STRIK-shun): "The blood vessels in your fingers, hands, and feet, for instance, will constrict.
The good news, Govindaraju noted, is that administering a heart drug that limits vasoconstriction prevented even 4-hour vibration sessions from causing significant vessel tightening or vacuole formation.
Phosphorylation of HSP20 is associated with vasorelaxation while phosphorylation of HSP25/27 is associated with vasoconstriction (2).
The key breakthroughs in the development of Hemospan were the understanding of the mechanisms of vasoconstriction and the development of simplified production methods that make the final product commercially viable.
8] This leads to peripheral vasoconstriction with elevation of blood pressure (BP) and shifts of blood to the central circulation.
By binding to nitric oxide, the free hemoglobin produces unopposed vasoconstriction with subsequent hypertension and bradycardia.

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