Which of the following statements is true of an electrocardiogram (ECG)?
A. The P wave of an ECG represents the depolarization of the ventricles.
B. The QRS wave of an ECG represents the depolarization of the atria.
C. The QT interval represents the time required for passage of an electrical impulse from the SA node through the AV node.
D. The T wave represents the repolarization of the ventricles.
Answer: D
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