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Match List-I (ECG) with List-II (Electrical activity of heart).
Column I
- A. P-wave
- B. QRS complex
- C. T wave
- D. End of T wave
Column II
- I. Depolarisation of ventricles
- II. End of systole
- III. Depolarisation of atria
- IV. Repolarisation of ventricles
Correct answer: A → III, B → I, C → IV, D → II
Detailed Solution
P-wave represents depolarisation of the atria (A-III); QRS complex represents depolarisation of the ventricles (B-I); T wave represents repolarisation of the ventricles (C-IV); the end of the T wave marks the end of systole (D-II).