In a skeletal muscle contraction, what happens after ACh binds to the nicotinic iontropic receptors on sarcolemma?

Acetyl choline, which is released at the neuromuscular junction is continuously broken down by the enzyme acetylcholineesterase into acetate and choline. Choline is once again taken up by the neuron through choline carriers to regenerate acetylcholine. This process continues as long as an the neuron is stimulated.

Source: Wikepedia