PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sympathetic division fibers leave the spinal cord in the:
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Thoracolumbar region, and postganglionic fibers secrete acetylcholine
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Craniosacral region, and postganglionic fibers secrete norepinephrine
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Craniosacral region, the preganglionic fibers secrete norepinephrine
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Thoracolumbar region, and postganglionic fibers secrete norepinephrine
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Explanation:
Detailed explanation-1: -thoracolumbar region, and the postganglionic fibers normally secrete norepinephrine. Answer ‘b’ is the correct statement. It is the parasympathetic fibers that have craniosacral origins, and it is the preganglionic fibers of both the sympathetic and parasympathetic systems that secrete acetylcholine.
Detailed explanation-2: -Sympathetic preganglionic fibers release acetylcholine (Ach) at their synapses in the ganglia. They are called cholinergic fibers because of their release of Ach. Sympathetic postganglionic fibers release mostly norepinephrine (NE) at their synapses in the smooth muscle of the target organs.
Detailed explanation-3: -Most sympathetic postganglionic fibers release norepinephrine.
There is 1 question to complete.