1. ATP at Myosin hydrolysed to ADP and inorganic Phosphate (ADP + P) 2.Myosin head extends and attaches to binding site on actin. CROSS BRIDGE FORMS. 3. In a POWER STROKE the myosin pulls the actin towards the M-line 4. SARCOMERE shortens 5. ADP+P release. Myosin remains until a new ATP attaches 6. Either process REPEATS or myosin remains unattached and muscle is relaxed