Acetylcholine
a. opens voltage-gated Na+ channels in skeletal muscle fibers, which causes depolarization of the muscle fibers
b. may decrease the permeability of the motor end plate to Na+ and K+ when combined with the receptor sites on the motor end plate
c. always depolarizes skeletal muscle fibers and postganglionic neurons
d. does both a and b
e. does both b and c
C
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