On an electrocardiogram, which of the following represents ventricular repolarization?
a. T wave c. ST segment
b. P–R interval d. QRS complex
ANS: A
Repolarization of the ventricles is represented by the T wave. The P–R interval is the time it takes for the impulse initiated in the atria to travel through the atrioventricular node. The ST segment occurs during ventricular depolarization, and the QRS complex represents ventricular depolariza-tion.
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