Question

in an ecg (electrocardiogram), the qrs complex represents
a depolarization of the atria
b depolarization of the ventricles
c repolarization of the atria
d repolarization of the ventricles

Explanation:

In an ECG, the P - wave represents atrial depolarization. The QRS complex is a result of ventricular depolarization. Atrial repolarization is usually masked by the QRS complex. The T - wave represents ventricular repolarization.

Answer:

B. depolarization of the ventricles