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Match List I with List II. List I: A. P wave; B. QRS complex; C. T wave; D. T-P gap. List II: I. Heart muscles are electrically silent; II. Depolarisation of ventricles; III. Depolarisation of atria; IV. Repolarisation of ventricles. Choose the correct answer from the options given below:
P wave = Atrial depolarisation (III); QRS = Ventricular depolarisation (II); T wave = Ventricular repolarisation (IV); T-P gap = Electrical silence / diastole (I)! Match: A-III, B-II, C-IV, D-I!
Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart: - The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria (A -> III). - The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction (B -> II). - The T-wave represents the return of the ventricles from excited to normal state (repolarisation) (C -> IV).
The interval between the end of the T wave and the beginning of the next P wave (T-P segment) represents the period of complete cardiac relaxation (joint diastole) during which ventricles and atria are relaxing and the heart is electrically silent (D -> I).
A-III, B-II, C-IV, D-I corresponds to Option (4).
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Mismatches P wave with ventricular depolarisation.
Mismatches P wave with ventricular repolarisation.
Mismatches P wave with electrical silence.
Accurately pairs all four ECG features with their definitive electrophysiological events.
Confusing atrial repolarisation with the T wave.
"The P-wave represents the electrical excitation (or depolarisation) of the atria... The QRS complex represents the depolarisation of the ventricles... The T-wave represents the return of the ventricles from excited to normal state (repolarisation)."
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