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The QRS complex in a standard ECG represents

1. Depolarisation of auricles
2. Depolarisation of ventricles
3. Repolarisation of ventricles
4. Repolarisation of auricles

Correct answer: Depolarisation of ventricles

Solution

The QRS complex corresponds to ventricular depolarisation, which produces the large, rapid deflection on an ECG because the ventricles have much more muscle mass than the atria. Atrial repolarisation happens at the same time but is hidden by the QRS complex.

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