Preganglionic fibers of the autonomic efferent pathway are ________ and secrete ________.
A. myelinated; acetylcholine (ACh) and norepinephrine(NE)
B. myelinated; norepinephrine (NE)
C. myelinated; acetylcholine (ACh)
D. unmyelinated; norepinephrine(NE)
E. unmyelinated; acetylcholine (ACh)
Answer: C
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