So once that power stroke actually takes place, we have to detach that myosin head from our thin filament. And the way that we do that is we basically bind an ATP molecule onto our mic and head. So in the last step, we basically take an ATP molecule and we bind it onto our myosin head and that releases our thin filament from our thick filament. At the same time, the calcium that is bound to our troponin is basically released and that means our tropomycin closes that binding site. So now our myosin head can no longer bind to our actin filament. So when ATP binds to our mycin head, it causes it to detach.