What does the T wave in the cardiac cycle represent?

The T wave in the cardiac cycle specifically represents heart repolarization. This phase follows the depolarization of the heart, which is represented by the QRS complex in an electrocardiogram (ECG). During the T wave, the ventricles are returning to their resting state after contracting and pumping blood. This repolarization is crucial as it prepares the heart for the next cycle of depolarization and contraction, ensuring the heart can effectively rhythmically pump blood throughout the body.

Understanding the role of the T wave is essential in assessing cardiac health. Abnormalities in the T wave can indicate various cardiac issues, such as electrolyte imbalances or ischemia, highlighting the importance of this wave in clinical settings.