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Solution


Q.

Match List I with List II.

  List I   List II
A. P-wave I. Beginning of systole
B. Q-wave II. Repolarisation of ventricles
C. QRS complex III. Depolarisation of atria
D. T-wave IV. Depolarisation of ventricles

 

Choose the correct answer from the options given below:
1 A-II, B-IV, C-I, D-III  
2 A-I, B-II, C-III, D-IV  
3 A-III, B-I, C-IV, D-II  
4 A-IV, B-III, C-II, D-I  

Ans.

(3)

The P-wave represents the electrical excitation (or depolarisation) of the atria which leads to the contraction of both the atria. The QRS complex represents the depolarisation of the ventricles which initiates the contraction of ventricles. The contraction starts shortly after Q and marks the beginning of the systole. 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.