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## SA node - Sinoatrial node - Specialized group of cardiac muscle cells that don't contract - Located in the right atrium of the heart - Adapted to automatically generate impulses - Generator of heart rhythm - Basically the pace maker ## Electrical Cascade - As electricity moves through your hear...

## SA node - Sinoatrial node - Specialized group of cardiac muscle cells that don't contract - Located in the right atrium of the heart - Adapted to automatically generate impulses - Generator of heart rhythm - Basically the pace maker ## Electrical Cascade - As electricity moves through your heart, it causes each part it passes through to contract. This is called the electrical cascade. - While all of the cardiac muscle can conduct electricity, there are certain areas (the electrical conduction system) where the cascade travels at different speeds. - The cascade travels through the electrical conduction system in the following order. ## Sinoatrial node - The sinoatrial (SA) node is a cluster of cells that act as a