What represents the sum of all ventricular muscle cell depolarization?
a. PR interval
b. QRS complex
c. QT interval
d. P wave
ANS: B
The QRS complex represents the sum of all ventricular muscle cell depolarizations. The PR inter-val represents the onset of atrial activation to the onset of ventricular activity. The QT interval represents "electrical systole" of the ventricles. The P wave represents atrial depolarization.
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