1. Ca+2 are released from the sarcoplasmic reticulum and bind to troponin, causing tropomyosin to rotate and expose bonding sites 2. The myosin head attaches to the actin filament. The inorganic phosphate is released strengthening the bond to the actin filament 3. ADP is released, causing the myosin head to pivot and pull the actin filament towards the center of the sarcomere 4. Another ATP molecule attaches to the myosin head, causing it to detach from the actin filament 5. ATP is hydrolyzed into ADP and inorganic phosphate and energy released move the myosin head back into the cocked position 6. Calcium ions leave troponin causing tropomyosin to rotate and cover the binding sites

1. Ca+2 are released from the sarcoplasmic reticulum and bind to troponin, causing tropomyosin to rotate and expose bonding sites 2. The myosin head attaches to the actin filament. The inorganic phosphate is released strengthening the bond to the actin filament 3. ADP is released, causing the myosin head to pivot and pull the actin filament towards the center of the sarcomere 4. Another ATP molecule attaches to the myosin head, causing it to detach from the actin filament 5. ATP is hydrolyzed into ADP and inorganic phosphate and energy released move the myosin head back into the cocked position 6. Calcium ions leave troponin causing tropomyosin to rotate and cover the binding sites