What conveys electrical impulses from the sino-atrial node?

The sinoatrial (SA) node, located in the right atrium, is the primary pacemaker of the heart that initiates electrical impulses to regulate the heartbeat. After the electrical impulse is generated by the SA node, it travels through the atrial muscles and leads to the atrioventricular (AV) bundle, also known as the bundle of His. This structure is essential for conduction as it carries the electrical signals from the atria down to the ventricles.

The AV bundle is the connecting pathway that ensures the impulse reaches the ventricles after allowing time for the atria to contract and fill the ventricles with blood. This sequential conduction is vital for maintaining an organized and efficient heartbeat, allowing for the proper timing of atrial and ventricular contractions. Hence, understanding the role of the AV bundle in conducting impulses from the SA node is crucial for grasping how the heart maintains its rhythmic beating.