The QRS complex represents which of the following?
a. Atrial depolariza-tion c. Ventricular repolar-ization
b. Ventricular depo-larization d. Threshold potential
ANS: B
Ventricular depolarization is represented on the electrocardiogram as the QRS complex. The P wave represents atrial depolarization. The T wave represents ventricular repolarization. Threshold potential is the critical level of electrical excitation reached by any cell, causing an action poten-tial to occur.
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