Kinesiology 4432A/B Study Guide - Final Guide: Superior Cervical Ganglion, Middle Cerebral Artery, Cerebral Circulation
14 Apr 2018
School
Department
Course
Professor
Document Summary
The net response is the integrated response of that particular region of the brain. The biggest effect that sympathetic activation appears to have in the control of brain blood flow is how it interacts with the myogenic (autoregulatory) events. If you have an increase in blood pressure, there is vasoconstriction occurring to make sure the blood flow does not go too high. If you stand up, blood pressure drops, so dilation increases to make sure the blood flow stays constant; and if it does drop it only drops for a couple of seconds. If you add pressure to a cerebral artery, it will first expand and then constrict to preserve blood flow. Cerebral arteries relatively (but not completely) insensitive to adrenergic agonists. Mesenteric vascular bed is very reactive to sympathetic control; less dosage of. Epinephrine and nonepinephrine is needed for a constrictor response of the same size between mesenteric and cerebral vessels.
