QuestionFebruary 1, 2026

10. The QRS complex on an ECG represents a. the repolarization of the atria and the depolarization of the ventricles. b. only the depolarization of the ventricles. c. the repolarization of the ventricles. d. the ion concentration shift caused by the depolarization of the atria.

10. The QRS complex on an ECG represents a. the repolarization of the atria and the depolarization of the ventricles. b. only the depolarization of the ventricles. c. the repolarization of the ventricles. d. the ion concentration shift caused by the depolarization of the atria.
10. The QRS complex on an ECG represents
a. the repolarization of the atria and the depolarization of the ventricles.
b. only the depolarization of the ventricles.
c. the repolarization of the ventricles.
d. the ion concentration shift caused by the depolarization of the atria.

Solution
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Answer

b. only the depolarization of the ventricles. Explanation 1. Identify cardiac events represented by ECG components P wave = atrial depolarization; QRS complex = ventricular depolarization (atrial repolarization occurs simultaneously but is masked); T wave = ventricular repolarization. 2. Select the correct description The QRS complex primarily reflects **ventricular depolarization** only.

Explanation

1. Identify cardiac events represented by ECG components <br /> P wave = atrial depolarization; QRS complex = ventricular depolarization (atrial repolarization occurs simultaneously but is masked); T wave = ventricular repolarization.<br /><br />2. Select the correct description <br /> The QRS complex primarily reflects **ventricular depolarization** only.
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