Electrocardiography, Dr. D. Penney

Figure 1. The conduction system for the cardiac action potential. Normally the SA node depolarizes first and then the rest of the atria. After a delay at the AV junctional tissue, the action potential is conducted down the AV node, to the AV bundle, to the bundle branches, to the Purkinje fibers, and then to the right and left ventricles.


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