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When a muscle fiber is held at a voltage of 0 mV at the neuromuscular end plate, acetylcholine no longer produces a current because a. the acetylcholine receptor channels all close instantly at 0 mV. b. an influx of sodium is balanced by an equal efflux of potassium. c. the membrane conductance for each permeant ion is 0 at 0 mV. d. at 0 mV, the potassium ions lodge in the receptor channel and block the influx of sodium. e. the Nernst potentials for both sodium and potassium are 0 mV in muscle fibers.
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