Actin/Myosin muscle contraction flow diagram

Action potential

Calcium is released from Sarcoplasmic Reticulum

Calcium binds to troponin, active site is revealed

Heads of cross bridge attach to actin at active site

Power Stroke -Head of cross bridge tilts and also pulls actin filament

Myosin attraction to actin is lost. Powerstroke completes

ATP binding site is revealed on myosin head

ATP-> ADP causes myosin to return to origninal conformation and releases from actin