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Crossbridge cycle, Myosin head 'cocked' (in high energy state) at ~90° Muscle contraction controlled by blocking at this point when [Ca2+] is low., Myosin head 'cocked' (in high energy state) at ~90° Myosin head binds to actin (crossbridge formed), Myosin head 'pulls' against actin, moving to ~45° ATP binds Myosin detaches from actin, Myosin detaches from actin ATP hydrolysed to ADP and Pi Myosin head 'cocked' (in high energy state) at ~90°, Myosin head 'pulls' against actin, moving to ~45° ATP binds If no ATP is available, crossbridges cannot be destroyed. This is what happens in rigor mortis., Myosin head binds to actin (crossbridge formed) ADP and Pi released Myosin head 'pulls' against actin, moving to ~45°