PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Originating distal to the effector organ
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Unmyelinated
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Short
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Noradrenergic
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Detailed explanation-1: -Hence, the sympathetic postganglionic neurons are long and not short. Rather, the parasympathetic postganglionic neurons are short as their soma is in a ganglion near the target organ.
Detailed explanation-2: -The secretory elements of the major salivary glands are supplied with parasympathetic (cholinergic) nerve fibres. Sympathetic stimulation reduces the flow of saliva. So, the correct answer is option D.
Detailed explanation-3: -Postganglionic sympathetic fibers are long because they must travel from the ganglia all the way to their target organs.
Detailed explanation-4: -The post-ganglionic neurons are directly responsible for changes in the activity of the target organ via biochemical modulation and neurotransmitter release. The neurotransmitters used by postganglionic fibers differ. In the parasympathetic division, they are cholinergic and use acetylcholine as their neurotransmitter.