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

Answer: D

Psychology

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Explain how the link between the brain and mental disorders was first established

What will be an ideal response?

Psychology