Please note: reference image is displayed in place of Flash media.
The electrical system of the heart is made up of several parts that communicate with one another to signal the heart muscle fibers to contract. The sinoatrial (SA) node located in the right atrium initiates the electrical impulse. The SA node is the natural pacemaker of the heart. The electrical impulse spreads over the atrial muscles causing atrial contraction and then on to the atrioventricular (AV) node. From the AV node the impulse is conducted to the ventricular muscles through the bundle of His, which branches into Bundle Branches that run right and left between the ventricles causing the ventricles to contract. This flow of electrical signals produces a normal heartbeat.
©2018 Medmovie.com. All rights reserved. Medmovie.com creates and licenses medical illustrations and animations for educational use. Our goal is to increase your understanding of medical terminology and help communication between patients, caregiver and healthcare professionals. The content in the Media Library is for your information and education purposes only. The Media Library is not a substitute for professional medical advice, diagnosis or treatment for specific medical conditions.