The spread of the impulse through the ventricles (ventricular depolarization) is depicted on the ECG as the:
a. P wave.
b. QRS complex.
c. PR interval.
d. T wave.
B
The QRS complex is the spread of a stimulus through the ventricles and is measured as less than 0.10 second. The P wave is the spread of a stimulus through the atria. The PR interval is the time from the initial stimulation of the atria to the initiation of stimulation of the ventricles. The T wave is the return of stimulated ventricular muscle to a resting state.
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