Body Fluids and CirculationMedium
Question
Match List I with List II :
| 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:
Options
A.A-II, B-III, C-I, D-IV
B.A-IV, B-II, C-I, D-III
C.A-I, B-III, C-IV, D-II
D.A-III, B-II, C-IV, D-I
Solution
Sol. [Key Concept: Waves and intervals of an ECG]
P wave–atrial depolarisation (A–III); QRS complex–ventricular depolarisation (B–II); T wave–ventricular repolarisation (C–IV); T–P interval–no net electrical activity detected on the surface ECG, giving an isoelectric baseline (D–I). Hence, option (4). Electrically silent here describes the recorded net signal, not absence of all cellular electrical activity.
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