No, the electrical shock travels through the body and as it passes through the heart it causes the heart to depolarize, or contract. This will hopefully stop ventricular fibrillation and allow the hearts normal rhythm to return.
The electric shock travels through the person's nervous system (CNS) and travels through the neurones which then, to speak frankly, gets the heart to start pumping again by sending the person's brain the information to start the heart again whilst the actual shock of the electricity gives the person's heart a 'jump start'.
The Defibrillator is a device or equipment utilized to correct ventricular fibrillation. This is a condition wherein there is disorganized and rapid trembling of the heart muscles instead of the normal rhythmic beat. The patient is given a jolt of current electricity from this device, which is directed in the heart to get it back to its original rhythmic beat. This is done by placing a pair of metal paddles on the patient's chest. The shock stops individual muscle movement letting the natural pacemaker of the heart take over. A drug is injected once normal beat is restored to avoid further fibrillation. A defibrillator may be attached to the heart by implanting it under the skin for patient's who suffer from major heart diseases or those who are known to suffer from recurrent bouts of ventricular fibrillation.