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MCAT Question A Day - 6/26/13

Which statement is true about the autonomic nervous system?

A.  The sympathetic neurotransmitter, norepinephrine, speeds up all involuntary effectors.
B.  Norepinephrine speeds up some involuntary effectors and slows down others during “fight-or-flight” activities.
C.  Acetylcholine slows down some involuntary effectors and speeds up others during “normal” activities.
D.  B and C