On a normal ECG, a wave for repolarization of the atria is not recorded. Why?
A) the leads are not placed in a position to pick it up.
B) no repolarization of the atria occurs normally.
C) it occurs simultaneously with ventricular depolarization and is masked by the QRS complex.
D) it does not travel through body fluids.
E) it is too small to be picked up by external recording electrodes.

Question

Quizplus · Accepted Answer

Repolarization of the atria occurs simultaneously with ventricular depolarization and is therefore masked by the QRS complex, which records the depolarization of the ventricles. This is why it is not visible on a normal ECG.

On a Normal ECG, a Wave for Repolarization of the Atria