This course of known as the ability 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 released, the ATP molecule will get split into ADP and Pi by the myosin. The energy from the ATP resets the myosin head to its original position (re-extending your arm). The method is repeated. The actions of the myosin molecules are usually not synchronized -- at any given second, some myosins are attaching to the actin filament (gripping the rope), others are creating drive (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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