What does the T wave indicate on an EKG?

The T wave on an EKG represents the relaxation phase of the heart, specifically the repolarization of the ventricles. During this phase, the ventricles recover from the contraction that corresponds to the preceding QRS complex, where they contract and pump blood out of the heart. The T wave indicates that the electrical activity in the ventricles is returning to its baseline state, preparing them for the next heartbeat.

Understanding the role of the T wave is crucial for interpreting EKG readings, as it provides insight into the heart's recovery process after each contraction. Abnormalities in the T wave can indicate various cardiac conditions, such as ischemia or electrolyte imbalances, emphasizing its importance in clinical assessment. The distinction between ventricular contraction and relaxation helps clarify why the correct answer focuses on relaxation, aligning with the physiological processes occurring within the heart during an EKG examination.