vasomotion


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vasomotion

 [vas″o-mo´shun]
change in caliber of blood vessels.

va·so·mo·tion

(vā'sō-mō'shŭn, vas-ō-),
Change in caliber of a blood vessel.

vasomotion

A term referring to the cyclical variation of vascular tone (vasodilaton and vasoconstriction), which is under hormonal, neural and local control.

Vasomotion
Homonal control
• Aldosterone—promotes salt retention.
• Angiotensin II—vasoconstrictor, increases blood pressure.
• Antidiuretic hormone—promotes water retention.
• Atrial natriuretic peptide—Promotes salt excretion.
• Epinephrine—increases blood flow.
• Norepinephrine—increases blood flow.

Neural control
• Baroreflex—responds to increased pressure signals detected by the carotid sinus, sending the signal via the glossopharyngeal nerve to the vasomotor centre, resulting in a decrease in sympathetic tone and increased parasympathetic tone; the opposite occurs with hypotension—i.e., an increase in sympathetic tone and a decrease in parasympathetic tone.
• Chemoreflex—responds to changes in pH, CO2 and O2 by adjusting rates of respiration.
• Medullary ischaemic reflex—responds to sudden drops in blood supply to the brain by increasing the heart rate.

Local control
• Vasodilation in response to local ischaemia and accumulation of waste products.
• Angiogenesis in response to chronic ischaemia.

va·so·mo·tion

(vā'sō-mō'shŭn)
Change in caliber of a blood vessel.
Synonym(s): angiokinesis.
References in periodicals archive ?
Ballotta, "Vasomotion in multiple spontaneous cervical artery dissections," Stroke, vol.
Tohda et al., "Effects of curcuma drugs on Vasomotion in isolated rat aorta," Biological and Pharmaceutical Bulletin, vol.
From the SAS, CSF is driven into the Virchow-Robin spaces by a combination of arterial pulsatility, respiration, slow vasomotion, and CSF pressure gradients [19, 20].
Ikada, "Static magnetic field effects on impaired peripheral vasomotion in conscious rats," Evidence-Based Complementary and Alternative Medicine, vol.
After 12 weeks of treatment, those people receiving the homoeopathic preparation exhibited an increased number of nodal points, increased flow rates of erythrocytes in both arterioles and venules, increased vasomotion, and a slight reduction in hematocrit vs.
Endothelial regulation of vasomotion in apoE-deficient mice: implications for interactions between peroxynitrite and tetrahydrobiopterin.
Poised to respond to physical and molecular factors in the vasculature, the endothelium modulates the vascular smooth muscle contractile state and, as a result is a critical determinant of vasomotion and consequently blood flow.
An association between vasomotion and oxygen extraction.
regulatory changes leading to abnormal vasomotion and the expression of a prothrombotic and pro-inflammatory phenotype of the vascular endothelium." (1) It may include many changes in the gene expression, molecular expression and signaling, phenotypic cellular expressions, immune activation, and mechanical alterations to the tissues of the vascular system.
If it is assumed that there is no vasomotion in the area, the summed velocity data will be equal to the blood flow.
It is responsible for the movement of chyme in the gastrointestinal tract, intrauterine fluid motion, vasomotion of the small blood vessels and in many glandular ducts.