The Heart's Electrical System: Anatomy and Function
https://www.verywellhealth.com/cardiac-electrical-system-how-the-heart-beats-1746299
Mar 12, 2023 · The components of the heart's electrical system, including the sinus node (SN) and atrioventricular node (AV node), are illustrated here. You can see the two atria and the two ventricles. Separating them is a layer of fibrous tissue, labeled the AV disc. This tissue keeps the electrical signal passing through the AV node. In this figure:
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