CVS Practice Test 2025 – The All-In-One Guide to Exam Success!

The correct order of components in the cardiac conduction system begins with the sinoatrial (SA) node, which serves as the primary pacemaker of the heart. It generates electrical impulses that initiate the heartbeat. Following the SA node, the impulses travel through the internodal pathways to the atrioventricular (AV) node. The AV node plays a crucial role in delaying the transmission of the electrical signal to ensure the atria contract before the ventricles.

After the AV node, the impulse moves to the AV bundle, also known as the Bundle of His. This bundle conducts the impulses from the atria down to the ventricles. The AV bundle then splits into the bundle branches, which extend into the right and left ventricles. Finally, the impulses are conducted through the Purkinje fibers, which distribute the electrical signal throughout the ventricular walls, causing them to contract.

This sequence of events ensures that the heart beats in a coordinated and effective manner, allowing for optimal blood flow throughout the body. Understanding this order helps in recognizing how disruptions in this system can lead to various cardiac arrhythmias or conduction disorders.