Final answer:
The direction of the T wave is normally the same as the QRS complex that precedes it on an electrocardiogram (ECG), representing ventricular depolarization and subsequent repolarization.
Step-by-step explanation:
The direction of the T wave is normally the same as the QRS complex that precedes it. The P wave, QRS complex, and T wave are prominent points on an electrocardiogram (ECG). The P wave represents atrial depolarization, while the large QRS complex indicates ventricular depolarization. Ventricular contraction begins as the QRS reaches the R wave's peak. The QRS complex also masks the atrial repolarization during this process. Lastly, the T wave reflects ventricular repolarization, which occurs after ventricular contraction.