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 ?
5] These compensatory mechanisms with time become detrimental and result in sustained severe intrarenal arterial vasoconstriction with progressive physiological renal failure.
16,17) Therefore, at least a part of vasoconstriction during hypoxic gas ventilation is in concomitant with the reduction of NO production, which could influence superoxide release too.
Heat loss in this phase is the result of the normal gradient, from 2[degrees]C to 4[degrees]C, between the core to the periphery and the vasodilatation that exists at the peripheral level due to the loss of the mechanisms of vasoconstriction by anesthesia.
The first major mechanism is through vasoconstriction.
For example, in ABA and ABE there was a reduction in the Ach-mediated vasoconstriction suggesting activation of other mediators that promote vasodilation, such as prostacyclin, [H.
Somewhat of a pathologic variation to chronic pulmonary vasoconstriction is pulmonary venous hypertension, consequential to mitral stenosis or left ventricular failure.
Of these, about a quarter ended up with a diagnosis of nipple vasoconstriction.
Title: Reversible Cerebral Vasoconstriction Syndrome: Systematic Appraisal of the Literature
Firstly, scalp cooling causes blood vessel vasoconstriction, which dramatically reduces blood flow to the scalp and it has been suggested that less chemotherapeutic drug is delivered to the hair follicles.
Antidiuretic hormone also called vasopressin has been shown to induce vasoconstriction and might cause a slight increase in blood pressure.

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