What does the impulse traveling through the His-Purkinje system generate on the ECG?

The impulse traveling through the His-Purkinje system generates the QRS complex on the ECG. This complex represents the depolarization of the ventricles, which is a crucial aspect of the cardiac cycle. When the electrical signal travels down the His bundle and into the Purkinje fibers, it causes the ventricles to contract, pumping blood to the lungs and the rest of the body.

The QRS complex is essential for assessing the heart's electrical activity and function. Its characteristics, such as duration and morphology, provide insights into the health of the cardiac conduction system and the ventricles themselves. Abnormalities in the QRS complex can indicate various conditions, including bundle branch blocks or ventricular hypertrophy.

In contrast, the P wave reflects atrial depolarization, while the T wave corresponds to ventricular repolarization. The U wave, though less distinct, is thought to represent the repolarization of the Purkinje fibers or the late repolarization of the ventricles. Understanding these differences helps in accurately interpreting the ECG and assessing cardiac health.