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This course of is named the power stroke. During the power stroke, myosin releases the ADP and Pi. Once ADP and Pi are released, a molecule of adenosine triphosphate (ATP) binds to the myosin. When the ATP binds, the myosin releases the actin molecule (letting go of the rope). When the actin is launched, the ATP molecule will get split into ADP and Pi by the myosin. The power from the ATP resets the myosin head to its authentic place (re-extending your arm). The process is repeated. The actions of the myosin molecules aren't synchronized -- at any given moment, some myosins are attaching to the actin filament (gripping the rope), others are creating pressure (pulling the rope) and others are releasing the actin filament (releasing the rope). The contractions of all muscles are triggered by electrical impulses, whether transmitted by nerve cells, created internally (as with a pacemaker) or applied externally (as with an electrical-shock stimulus).
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