ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.
(a) Depolarisation of atria
(b) Repolarisation of atria
(c) Depolarisation of ventricles
(d) Repolarisation of ventricles
The answer is the option (b) Repolarisation of atria
Explanation: In a normal ECG, P-wave depolarization of atria, QRS complex-ventricular depolarization, T-wave repolarization of ventricles are depicted. Therefore, the repolarization of atria is not shown.