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The QRS complex in a standard ECG represents :

a) Depolarisation of ventricles

b) Repolarisation of ventricles

c) Repolarisation of auricles

d) Depolarisation of auricles
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a) Depolarisation of ventricles

Explaination::

The QRS complex represents the depolarisation of the ventricles, which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole.
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