Question

The repolarization phase of cardiac cycle is represented by which portion of an ECG?

• A. P
• B. QRS
• C. S
• D. T

Answer 1

The correct option is D T

ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria. The T-wave represents the return of the ventricles from excited to normal state (repolarisation). The end of the T-wave marks the end of systole.