Match List I with List II regarding the events represented by a standard Electrocardiogram (ECG). List I List II A P-wave 1 Return of ventricles from excited to normal state B QRS complex 2 Marks the end of systole C T-wave 3 Leads to contraction of both atria D End of T-wave 4 Initiates ventricular contraction Choose the correct answer from the options given below:

Step-by-step solution

The P-wave represents the electrical excitation or depolarisation of the atria, which leads to the contraction of both the atria. Thus, A matches with 3. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. Thus, B matches with 4. The T-wave represents the repolarisation of the ventricles, which is the return of the ventricles from an excited to a normal state. Thus, C matches with 1. The end of the T-wave marks the end of ventricular systole. Thus, D matches