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Match List I with List II.

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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 :

a

A-IV, B-III, C-II, D-I

b

A-II, B-IV, C-I, D-III

c

A-I, B-II, C-III, D-IV

d

A-III, B-I, C-IV, D-II

✓ Correct answer: d)

A-III, B-I, C-IV, D-II

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