Which are electrical “nodes” of the heart? Check all that apply.

The heart’s electrical conduction system includes the sinoatrial (SA) node, which normally starts each heartbeat, and the atrioventricular (AV) node, which relays the electrical signal toward the ventricles. The aortic node and lymph node are not electrical nodes of the heart, and “heart node” is not the name of a specific conduction-system structure.

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