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The heart's rhythm is controlled by an intrinsic pacemaker producing electrical current which travel to various parts of heart in a coordinated manner to ensure proper pumping function through electrical cables called nerves. Any disturbance in this electric system may lead to abnormal heart rhythm called arrhythmia.

Normally a group of cells known as sinus node situated in heart upper chamber - right atrium function as pacemaker and initiates electrical impulse which travels down to AV node - a specialised electrical tissue which functions to regulate transmission of electrical impulses from upper chamber of heart known as atria to lower chamber of heart known as ventricles. From there electrical impulse travel to both ventricles in a co ordinated manner via electrical cables known as left and right bundle and their branches to left and right ventricle to ensure co ordinated  contraction and generation of good cardiac output.