Question

the neurotransmitter at the neuromuscular junction increases permeability of the muscle cell membrane to multiple choice calcium ions sodium ions phosphate chloride

Explanation:

At the neuromuscular junction, the neurotransmitter acetyl - choline binds to receptors on the muscle cell membrane, increasing its permeability mainly to sodium ions. This influx of sodium ions leads to depolarization of the muscle cell membrane, initiating muscle contraction.

Answer:

B. Sodium ions