Topic: Circulation: heart, cardiac cycle, ECG, double circulation, regulation, disorders· Human Physiology

The QRS complex in a standard ECG represents :

1. Repolarisation of auricles

2. Depolarisation of auricles

3. Depolarisation of ventricles

4. Repolarisation of ventricles

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Answer: 3. Depolarisation of ventricles

In an ECG, the P wave is atrial depolarisation, the QRS complex is ventricular depolarisation (the start of ventricular contraction), and the T wave is ventricular repolarisation.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The QRS complex in a standard ECG represents :

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