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Normal Heartbeat - ECG, EKG Reading. This medical illustration features an EKG monitor reading showing a recording of the electrical impulses generated by the sinuatrial (SA) and atrioventricular (AV) nodes of the heart. The artrioventricular node is illuminated. The illustration also includes a cut-away view of the heart and great vessels. The cardiac muscles and seperate atria and ventricles can be viewed.
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