Question

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the binding of acetylcholine to its receptors on the motor end plate results in increased membrane permeability to blank ions and potassium ions.
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Explanation:

When acetylcholine binds to its receptors on the motor - end plate, it causes ligand - gated ion channels to open. These channels allow sodium ions ($Na^+$) and potassium ions ($K^+$) to pass through the membrane. The influx of sodium ions is a major event in the generation of an end - plate potential.

Answer:

sodium