In the parasympathetic system,the terminal buttons of preganglionic fibers secrete ________,whereas the postganglionic fibers secrete ________.
A) norepinephrine; acetylcholine
B) glutamate; acetylcholine
C) serotonin; norepinephrine
D) acetylcholine; acetylcholine
E) acetylcholine; norepinephrine
Correct Answer:
Verified
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