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step 5 and 6
Calcium ions are released by sarcoplasmic reticulum into the sarcoplasm.
When ATP breaks down it releases energy, releasing the head of the myosin.
Calcium ions bind to troponin, exposing the binding site on the actin filament.
To form a cross bridge the head of the myosin attaches to the exposed binding actin.
When the cross bridge flexes it pulls the actin filament towards the center of the sarcomere.