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What is All are true about the Sympathetic vasodilator system except and explain in detail?
There is no tonic activity in the vasodilator fibers(sympathetic), but the vasoconstrictor fibers to most vascular beds have some tonic activity Sympathetic noradrenergic fibers end on blood vessels in all pas of the body to mediate vasoconstriction- So sympathectomy cause vasodilation Resistance vessels in skeletal muscles are innervated by vasodilator fibers, which, although they travel with the sympathetic nerves, are cholinergic (sympathetic cholinergic vasodilator system) Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:556