How would you describe the electrical activity during the T wave?

The T wave on an electrocardiogram (ECG) represents the process of ventricular repolarization. During this phase, the muscle cells in the ventricles, which had previously depolarized to facilitate contraction and pumping of blood, are returning to their resting state. This involves the outward movement of potassium ions from the cells, which leads to a shift in electrical charge and ultimately restores the resting membrane potential.

Understanding that the T wave specifically reflects ventricular repolarization is crucial for the interpretation of an ECG, as it provides insight into the heart's electrical activity and the recovery phase following contraction. Accurately recognizing this stage in the cardiac cycle can help in assessing heart health and diagnosing various cardiac conditions.