why depolarisation wave(QRS-complex) in an ECG is stronger than repolarisation wave?

Question

QRS-complex is ventricular depolarisation and T-wave is ventricular repolarisation in ECG.The former has higher amplitude than the later although they are both for ventricle

Answer 1

Not sure about this, but the amplitude of any EKG wave is due to net movement of charge toward that respective lead, and is thus why the QRS is largest in leads proximate to the apex. The synchronous wave of depolarization during ventricular contraction is responsible for the large amplitude of the QRS, but repolarization does not occur in the same synchronous manner per se, because they all repolarize at somewhat different rates, and it is definitely not oriented in one primary direction like the depolarizing event is, so one would not expect to see a drastic deflection like that of the QRS.