Match List I with List II : List I List II A Contraction of both atria I Marked by the end of T-wave B Beginning of ventricular systole II Occurs shortly after Q-wave C End of ventricular systole III Initiated by the P-wave D Heart beat rate of an individual IV Determined by counting QRS complexes 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 III. The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after the Q-wave and marks the beginning of the ventricular systole. Thus, B matches with II. The T-wave represents the return of the ventricles from excited to normal state (repolarisation). The end of the T-wave marks the