This course of is called the facility stroke. During the power stroke, myosin releases the ADP and Pi. Once ADP and Pi are launched, 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 gets split into ADP and Pi by the myosin. The energy from the ATP resets the myosin head to its unique position (re-extending your arm). The method is repeated. The actions of the myosin molecules are not synchronized -- at any given second, 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 or not transmitted by nerve cells, created internally (as with a pacemaker) or applied externally (as with an electrical-shock stimulus).
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