This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Sympathetic system has adrenergic nerve endings at all sites except- \nSelect and explain. \nA. Heart, B. Blood vessels in skeletal muscles, C. Eye, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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", 'role': 'assistant'}]