Heart's Electrical System, Illustration

Heart's Electrical System, Illustration

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Credit: Monica Schroeder/SCIENCE PHOTO LIBRARY

Caption: Illustration depicting the heart's electrical system (green circuitry) with a normal EKG in the background. The sinoatrial (SA) node (thick yellow oval upper left) consists of self-excitatory muscle cells that contract rhythmically at around 70 beats per minute. Following each contraction, an impulse spreads through the heart's upper chambers (atria, upper frame) to the atrioventricular (AV) node (thick yellow oval opposite SA node). Contraction of the atria causes blood to move into the lower chambers (ventricles, lower frame).

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Keywords: anatomical, anatomy, art, artery, artwork, atrioventricular, atrioventricular node, av node, biology, blood, blue background, bundle of his, cardiac, cardiology, circulation, circulatory, circulatory system, coronary, ecg, ekg, electric, electrical, electrocardiogram, heart, heartbeat, illustration, medical, medicine, normal, normal heart rate, physiology, sa node, sinoatrial, sinoatrial node, vein

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