Action Potential Arrives at the neuromuscular junction release calcium, The neurotransmitter Acetylcholine carries the impulse across the synapse, Calcium is released into the Sarcoplasm Reticulum, The calcium binds with the troponin, The tropomyosin moves, exposing the binding site, A cross bridge is formed between the actin & myosin, A powerstroke is performed, The I band & H zone is reduced, ATP is required to break the crossbridge, A NEW crossbridge is formed and the process is repeated, The H zone dissapears.

Sliding Filament Theory

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