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Autonomic Nervous System Mcqs

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   Autonomic nervous system mcqs  True / False MCQs 1. Regarding the ANS a) Preganglionic fibers are myelinated B fibers. b) Sympathetic post ganglionic nerves enter the spinal nerve via white ramus. c) Preganglionic parasympathetic fibres to the urinary bladder travel in the 2nd to 4th sacral nerves. d) All preganglionic fibers of the ANS are cholinergic. e) Postganglionic fibers of the sympathetic system that supply the ciliary muscles of the eye are adrenergic. 2. Regarding the receptors of ANS a) β1 receptors are present in heart muscle.   b) Stimulation of β2 receptors constricts blood vessels and skeletal muscles.  c) Ach is the neurotransmitter of the parasympathetic gang lion. d) α1 receptors at sympathetic ganglions are stimulat ed by Ach. e) α2 receptors are stimulated by noradrenaline.  3. Sympathetic stimulation results in a) Pupillary constriction. b) Sweating c) Relaxation of bronchial smooth muscle. d) Contraction of blood vessels in skin. e) Slowing of the heart rate. 4. In the autonomic nervous system a) Efferent fibres are myelinated A type fibres. b) Muscarinic cholinergic receptors are blocked by atropine. c) Sympathetic stimulation slows the heart rate. d) β1 receptors are present in the heart.  e) Acetylcholine is the neurotransmitter at the parasympathetic ganglion. 5. Regarding α adrenergic receptors  a) Contained in smooth muscle. b) Can be distinguished from β receptors when observed under the electron microscope.  c) Can be stimulated by adrenalin and noadrenalin. d) In skin mediates vasoconstriction by adrenalin. e) Consists of many subtypes.   6. Regarding sympathetic nervous system a) Neuromuscular transmission at the heart is mediated by adrenaline. b) Neuromuscular transmission at skin arterioles is mediated by acetylcholine. c) Has short post ganglionic and long pre ganglionic fibres. d) Neuroglandular transmission at sweat glands is mediated by noradrenaline. e) Ganglionic transmission is mediated by acetylcholine. 7. Giving alpha blocking drugs a) Increases peripheral resistance b) Increases heart rate c) Increases secretion of sweat glands. d) Bronchodilation. e) Increases contractility of the heart. - See more at: http://www.physiologyexam.com/2012/12/autonomic-nervous-system-mcqs.html#sthash.cMxWt8WJ.dpuf   
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