The sinoatrial node (SA node) is an important part of the heart that regulates the rhythm of the heartbeat. It is commonly referred to as the heart's natural pacemaker. There are several other terms that can be used to describe this node, including the sinus node, the Keith-Flack node, and the sinoatrial knot. The SA node is located in the right atrium of the heart and generates electrical impulses that control the heartbeat. When the SA node fails to function correctly, various heart conditions such as arrhythmia can occur. Therefore, understanding synonyms for this vital part of the heart is crucial for healthcare professionals to accurately diagnose and treat any heart issues.