What does the T wave in the cardiac cycle represent?

The T wave in the cardiac cycle is significant because it represents ventricular repolarization. This is a vital phase where the ventricles recover and prepare for the next cycle of contraction. During this period, the myocardial cells of the ventricles transition back to their resting state after having been depolarized during the contraction phase, which is represented by the QRS complex.

This phase is critical for the heart’s function as it allows the ventricles to reset electrically and is integral to maintaining a proper rhythm and effective pumping of blood throughout the body. When analyzing the electrocardiogram (ECG), the T wave can provide insights into the heart's electrical habits and can indicate potential issues if abnormalities are present.

The other options relate to different phases or parts of the heart's electrical conduction system. Atrial depolarization corresponds to the P wave, while the Bundle of His and the conduction through the atrioventricular node pertain to specific steps in the conduction pathway, neither of which represent the recovery state of the ventricles captured by the T wave.