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Solution


Q.

Match List I with List II.                                                 [2024]

  List I   List II
A. P wave (I) Heart muscles are electrically silent
B. QRS complex (II) Depolarisation of ventricles
C. T wave (III) Depolarisation of atria
D. T-P gap (IV) Repolarisation of ventricles

 

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

Ans.

(2)

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 T-P gap represents the time when the heart muscles are electrically silent.