Which part of the heart is the SA node located?

The sinoatrial (SA) node, which is often referred to as the heart's natural pacemaker, is located in the right atrium of the heart. This strategic location allows the SA node to effectively regulate the heart's rhythm by generating electrical impulses that initiate each heartbeat. The impulses generated by the SA node spread through the walls of the right and left atria, prompting them to contract and pump blood into the ventricles.

The placement of the SA node in the right atrium is crucial for establishing the correct sequence of contractions throughout the heart, ensuring efficient blood flow. By being positioned in the right atrium, the SA node can quickly influence the atrial myocardium, allowing for synchronous contraction of the atria before the signal travels to the atrioventricular (AV) node and subsequently to the ventricles.

This prominent role in impulse generation and rhythm control is why the sinus node's location in the right atrium is so critical to the heart's overall function.