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Vasoconstriction. Vasoconstriction is the narrowing of the blood vessels resulting from contraction of the muscular wall of the vessels, in particular the large arteries and small arterioles. The process is the opposite of vasodilation, the widening of blood vessels. The process is particularly important in controlling hemorrhage and reducing ...
2.) The vessels of the exocrine gland are dilated on parasympathetic stimulation 3.) The cutaneous vessels are dilated locally to produce the flare after an injury. The vasodilation is produced by the afferent impulses in the cutaneous nerves which pass antidromically in their collaterals to their blood vessels (axon reflex) [1]
Both of these factors affect pH and, in turn, the balance between vasodilation versus vasoconstriction in the brain. [3] [4] So, the blood vessels found specifically in the brain respond changes in dissolved carbon dioxide levels. Coronary (heart) circulation is controlled at the local level primarily by metabolic control mechanism. More ...
It causes vasoconstriction in many blood vessels, including those of the skin, gastrointestinal system, kidney (renal artery) [16] and brain. [17] Other areas of smooth muscle contraction are: ureter; vas deferens; hair (arrector pili muscles) uterus (when pregnant) urethral sphincter; urothelium and lamina propria [18]
Hemostasis. In biology, hemostasis or haemostasis is a process to prevent and stop bleeding, meaning to keep blood within a damaged blood vessel (the opposite of hemostasis is hemorrhage). It is the first stage of wound healing. Hemostasis involves three major steps: vasoconstriction.
Blood vessels with α 1-adrenergic receptors are present in the skin, the sphincters [4] of gastrointestinal system, kidney (renal artery) [5] and brain. [6] During the fight-or-flight response vasoconstriction results in decreased blood flow to these organs. This accounts for the pale appearance of the skin of an individual when frightened.
Sympathetic nervous system stimulation causes vasoconstriction of most blood vessels, including many of those in the skin, the digestive tract, and the kidneys. This occurs as a result of activation of alpha-1 adrenergic receptors by norepinephrine released by post-ganglionic sympathetic neurons.
Information on a cat's tendency towards obsessive compulsive disorders, anxiety, fear, and over-attachment to its owner is highly advantageous for diagnosis and treatment. Wherever possible, cases of feline hyperesthesia syndrome should be referred to a specialist in feline behaviour for a secondary opinion. [2]