- action potential reaches sarcoplasmic reticulum, releasing Ca
- Ca binds to troponin causing it to bind to tropomyosin, removing it from myosin binding sites on actin
- actin binding sites bind to flexed myosin heads that snap back, pulling actin inward and shortening the sarcomere
- myosin heads release ADP and phosphate and grab a new ATP causing it to drop the actin bond.
- ATP is hydrolyzed which causes the myosin head to rebind actin and continue shortening the sarcomere
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