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Normal spread of electrical activity in the heart. A) Conducting system of the heart. B) Sequence of cardiac excitation. Top: Anatomic position of electrical activity. Bottom: Corresponding electrocardiogram. The yellow color denotes areas that are depolarized. (Reproduced with permission from Goldman MJ: Principles of Clinical Electrocardiography, 12th ed. Originally published by Appleton & Lange. Copyright © 1986 by McGraw-Hill.) Source: Origin of the Heartbeat & the Electrical Activity of the Heart, Ganong’s Review of Medical Physiology, 25e Citation: Barrett KE, Barman SM, Boitano S, Brooks HL. Ganong’s Review of Medical Physiology, 25e; 2016 Available at: http://mhmedical.com/ Accessed: May 05, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved