Explanation

The QRS complex represents ventricular depolarization, including the left and right ventricles.

However, it predominantly reflects the depolarization of the larger left ventricle.

Additional information:

The physiological Q wave is more than 0.02 seconds in duration: Incorrect. A physiological Q wave is typically less than 0.04 seconds in duration.

It is less than 25% of R wave magnitude: Incorrect. Normally, the Q wave is often much smaller than the R wave in magnitude.

The R wave is a major negative deflection: Incorrect. The R wave is a major positive deflection in the QRS complex.