Which of the following represents the correct electrical conduction pathway in the heart?

The correct answer illustrates the precise sequence of the electrical conduction pathway in the heart, which starts at the sinoatrial (SA) node. The SA node is known as the heart's natural pacemaker, generating electrical impulses that initiate the heartbeat. Following the SA node, the electrical signal travels to the atrioventricular (AV) node, where it briefly pauses to allow the ventricles to fill with blood.

From the AV node, the impulse continues through the Bundle of His, which further divides into right and left bundle branches, directing the impulses towards the Purkinje fibers. The Purkinje fibers spread throughout the ventricular myocardium, causing the ventricles to contract and pump blood to the lungs and the rest of the body.

This pathway ensures that the heart beats in a coordinated manner, allowing for effective blood circulation. Understanding this sequence is critical for interpreting EKG results and diagnosing various cardiac conditions. The other options do not follow the established order of conduction, which is crucial for proper heart function.