The heartbeat originates from a specialized group of cells called pacemaker cells, located in the sinoatrial (SA) node within the right atrium of the heart.
These pacemaker cells possess the unique ability to generate electrical impulses autonomously, initiating the cascade of events that leads to a heartbeat. This electrical signal then spreads through the atria, causing them to contract and pump blood into the ventricles.
Essentially, the SA node acts as the heart's natural pacemaker, dictating the rhythm and rate of the heartbeat.
