| 单词 | vasomotion |
| 释义 | vasomotionvasomotion[′vā·zə‚mō·shən]vasomotionvasomotion[vas″o-mo´shun]va·so·mo·tion(vā'sō-mō'shŭn, vas-ō-),vasomotionA 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)Synonym(s): angiokinesis. |
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