Final answer:
The QRS complex on the ECG pattern is responsible for the depolarization of the ventricles. This phase triggers the contraction of the ventricles to pump blood throughout the body and is prominently displayed due to the larger size of the ventricular cardiac muscle.
Step-by-step explanation:
The correct option : e
The part of the ECG pattern that is due to depolarization of the ventricles is the QRS complex. The P wave signifies the depolarization of the atria, while the T wave represents ventricular repolarization. During an ECG, each wave and complex represents specific electrical activities within the heart's conduction system. The QRS complex is the most prominent feature on the ECG and reflects the rapid depolarization of the right and left ventricles. As the ventricles are much larger than the atria, this part of the ECG tends to be larger and more pronounced than the P wave.
The significance of the QRS complex is highlighted by its role in triggering the ventricular contraction which is essential for pumping blood to the lungs and body. The electrical depolarization wave must travel a more intricate pathway within the ventricles, which is reflected in the QRS complex's characteristic shape and duration. Additionally, it's during the period of the QRS complex that atrial repolarization occurs, but this is masked in the ECG by the more dominant electrical activity of the ventricles.