Sympathetic system has adrenergic nerve endings at all sites except-

Ans. is 'b' i.e., Blood vessels in skeletal muscles * Sympathetic adrenergic fibers are those which secrete endogenous catecholamines {either adrenaline, norepinephrine / nor-adrenaline or dopamine}* Some sympathetic fibers do not secrete catecholamines but secrete acetylcholine -i) Sweat glandsii) Blood vessels in skeletal muscles Sympathetic fibers | | | Adrenergic Cholinergic | |||||Nor-adrenalineDopamineAdrenaline* Sweat glands* Most postganglionic sympathetic supply* Mesentric & renal vessels* Adrenal medulla* Blood vessels in skeletal muscles