How the Heart's Electrical System Works

The animation below shows how your heart's electrical system works. Click the "start" button to play the animation. Written and spoken explanations are provided with each frame. Use the buttons in the lower right corner to pause, restart, or replay the animation, or use the scroll bar below the buttons to move through the frames.

The animation shows how an electrical signal moves through your heart and how an EKG records your heart's electrical activity

Source:
National Heart, Lung and Blood Institute