Final answer:
The total duration of ventricular depolarization is represented by the QRS complex on the ECG, which illustrates the electrical activity required for ventricular contraction.
Step-by-step explanation:
The total duration of ventricular depolarization is represented by the QRS complex on the ECG. To be more specific, the QRS complex represents the depolarization of the ventricles and includes the obscured repolarization of the atria. For a comprehensive understanding, the small P wave indicates atrial depolarization, while the large QRS complex signifies ventricular depolarization, which demands a robust electrical signal due to the large size of the ventricular cardiac muscle. As the QRS reaches the peak of the R wave, the ventricles begin to contract. The T wave, thereafter, represents the repolarization of the ventricles. Understanding the ECG components, such as the QRS complex, is critical for accurately monitoring and diagnosing cardiac function.