Where does the acetylcholine released for muscle contraction bind?

Acetylcholine released at neuromuscular junctions binds to the acetylcholine receptors (AChRs) located on the sarcolemma of the muscle cells. These AChRs are specifically designed to recognize and bind to acetylcholine molecules. When acetylcholine binds to these receptors, it triggers a series of events leading to muscle contraction.