Certified Cardiographic Technician (CCT) Practice Exam 2025 – Your All-in-One Guide to Exam Success!

The Bundle of His is a critical component of the heart's electrical conduction system, and its primary function is to conduct impulses from the atrioventricular (AV) node to the ventricles. After the electrical signals generated by the sinoatrial (SA) node and transmitted through the atria, the impulses reach the AV node, where there is a brief delay allowing the ventricles to fill with blood. Following this, the Bundle of His carries the impulses down into the ventricles via the right and left bundle branches. This pathway ensures that the ventricles contract in a synchronized manner after they have filled, facilitating effective pumping of blood to the lungs and the rest of the body.

The regulation of heart rate through hormone secretion is primarily managed by the autonomic nervous system and certain hormones, which is not the direct role of the Bundle of His. Similarly, while it is involved in the conduction pathway, it does not connect the atria and ventricles directly but rather runs along the interventricular septum to relay impulses from the AV node. The conduction of impulses from the SA node is an earlier stage in the pathway that occurs before the impulses reach the Bundle of His, making it a different functional aspect altogether.