Which segment in an EKG corresponds to diastole?

The T-R portion of an EKG is associated with diastole because it represents the time between the end of ventricular repolarization (the T wave) and the beginning of the next atrial depolarization (the next P wave). During diastole, the heart muscle relaxes, allowing the chambers to fill with blood. This period is crucial for the heart to refill before the next contraction. The T-R portion encapsulates this filling phase after the ventricles have finished contracting and are preparing for the next cycle. In contrast, the other segments mentioned are related to different parts of the cardiac cycle, primarily involving the mechanical actions of contraction (systole) or the electrical activities associated with those contractions.