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Question
Which of the following correctly explains a phase/ event in cardiac cycle in a standard electrocardiogram?
Options
QRS complex indicates atrial contraction.
QRS complex indicates ventricular contraction.
Time between S and T represents atrial systole.
P-wave indicates beginning of ventricular contraction.
Solution
QRS complex indicates ventricular contraction.
Explanation:
- P-wave – Atrial depolarisation (atrial systole/contraction)
- QRScomplex – Ventriculardepolarisation(ventricular systole/contraction)
- T-wave – Ventricular repolarisation (ventricular relaxation)
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