Heart Physiology Practice Exam – Prep, Practice Questions & Study Guide

The T wave on an ECG represents ventricular repolarization. This phase occurs after the ventricles have contracted and ejected blood, which is reflected in the preceding QRS complex that indicates ventricular depolarization (contraction). During repolarization, the ventricular muscle cells restore their resting electrical state after the action potential triggered by depolarization. The T wave is critical as it signifies the recovery phase for the ventricles, preparing them for the next cycle of depolarization and contraction. Understanding this allows for better insight into cardiac cycle dynamics, as appropriate repolarization is essential for maintaining normal heart rhythm and function.