Question
What does the complex between the red lines in the ECG indicates?
A. Atrial Depolarisation.
B. Atrial repolarisation.
C. Ventricular Depolarisation.
D. Ventricular Repolarisation.
Show Answer
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Correct Answer » A
Explanation
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Ans: C. Ventricular Depolarisation.
QRS complex is shown in the image(seen between the red lines)
ECG
- P wave: the sequential activation (depolarization) of the right and left atria
- QRS complex: right and left ventricular depolarization (normally the ventricles are activated simultaneously)
- ST-T wave: ventricular repolarization
- U wave: origin for this wave is not clear – but probably represents “afterdepolarizations” in the ventricles
- PR interval: time interval from onset of atrial depolarization (P wave) to onset of ventricular depolarization (QRS complex)
- QRS duration: duration of ventricular muscle depolarization
- QT interval: duration of ventricular depolarization and repolarization
- RR interval: duration of ventricular cardiac cycle (an indicator of ventricular rate)
- PP interval: duration of atrial cycle (an indicator of atrial rate)
