Question

question: ____ is released by motor neurons at neuromuscular junctions. this prompts calcium to move into a muscle cell.

Explanation:

At the neuromuscular junction, motor neurons release acetylcholine. When acetylcholine binds to receptors on the muscle cell, it triggers a series of events that lead to calcium ions moving into the muscle cell, which is crucial for muscle contraction.

Answer:

Acetylcholine