QuestionJuly 22, 2025

Movement of sodium ions into the muscle cell at the neuromuscular junction causes __ A. Repolarization of the muscle cell membrane B. Depolarization of the muscle cell membrane C. Re-uptake of acetylcholine D. Release of acetylcholine

Movement of sodium ions into the muscle cell at the neuromuscular junction causes __ A. Repolarization of the muscle cell membrane B. Depolarization of the muscle cell membrane C. Re-uptake of acetylcholine D. Release of acetylcholine
Movement of sodium ions into the muscle cell at the
neuromuscular junction causes __
A. Repolarization of the muscle cell membrane
B. Depolarization of the muscle cell membrane
C. Re-uptake of acetylcholine
D. Release of acetylcholine

Solution
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Answer

B. Depolarization of the muscle cell membrane Explanation 1. Identify the effect of sodium ion movement Sodium ions entering a muscle cell cause a change in membrane potential. 2. Determine the type of membrane potential change The influx of sodium ions leads to depolarization, making the inside of the cell more positive.

Explanation

1. Identify the effect of sodium ion movement<br /> Sodium ions entering a muscle cell cause a change in membrane potential.<br />2. Determine the type of membrane potential change<br /> The influx of sodium ions leads to depolarization, making the inside of the cell more positive.
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