Electrical activity recorded by the electrocardiogram (ECG) tracing that denotes the spread of the stimulus through the atria is the:
a. P wave.
b. PR interval.
c. QRS complex.
d. ST segment.
A
The P wave represents the spread of a stimulus through the atria (atrial depolarization). The PR interval is the time from the initial stimulation of the atria to the initial stimulation of the ven-tricles, usually 0.12 to 0.20 second. The QRS complex is the spread of a stimulus through the ventricles (ventricular depolarization), less than 0.10 second. The ST segment and T wave are the return of stimulated ventricular muscle to a resting state (ventricular repolarization).
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