What does the QRS complex in an ECG represent?

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Study for the Cardiovascular Disorders Test. Utilize flashcards and multiple choice questions with explanations. Prepare thoroughly for your exam!

Multiple Choice

What does the QRS complex in an ECG represent?

Explanation:
The QRS complex represents ventricular depolarization—the rapid electrical activation of the ventricles that triggers their contraction. The atria's electrical activity is shown earlier as the P wave, while ventricular repolarization appears later as the T wave. Atrial repolarization occurs during the QRS but is masked by the much larger ventricular depolarization signal.

The QRS complex represents ventricular depolarization—the rapid electrical activation of the ventricles that triggers their contraction. The atria's electrical activity is shown earlier as the P wave, while ventricular repolarization appears later as the T wave. Atrial repolarization occurs during the QRS but is masked by the much larger ventricular depolarization signal.

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