Noradrenaline is major neurotransmitter in ?
Correct Answer: Postganglionic sympathetic fibres except in sweat glands
Description: Ans. is 'b' i.e., Postganglionic sympathetic fibres except in sweat glandsNeurotransmitter in all preganglionic autonomic nerves (both sympathetic and parasympathetic) is acetylcholine (A CH)Neurotransmitter in all ganglia (both sympathetic and parasympathetic) is acetylcholine.Neurotransmitter in postganglionic parasympathetic fibres is acetylcholine.In posganglionic sympathetic fibres, the major neurotransmitter is noradrenaline (NA) except in renal and mesentric vasculature where it is dopamine, in sweat glands, some blood vessels where it is acetylcholine and in adrenal medulla where it is adrenaline.Most of the visceral organs are supplied by both sympathetic and parasympathetic system except;Blood vessels, spleen, sweat glands and hair follicles receive only sympathetic innervation.Ciliary muscle gastric and pancreatic glands receive only parasympathetic innervation.In general sympathetic and parasympathetic systems are antagonistic except :Refractory period of atrial fibres is decreased by both.At almost all organs except hea, cholinergic system has excitatory activity and adrenergic system has relaxing propeies Sympathetic system stimulates (Tachycardia, Positive inotropic) and parasympathetic system depresses (Bradycardia, Negative inotropic) the hea.
Category:
Physiology
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now