On an electrocardiogram (ECG), which waveform corresponds directly to ventricular depolarization?
Answer and explanation
Correct answer: D. The QRS complex
- Step 1: The P wave represents atrial depolarization. Step 2. The QRS complex represents rapid ventricular depolarization preceding ventricular contraction. Step 3. The T wave represents ventricular repolarization. Answer: The QRS complex. Why not the others: P wave is atrial depolarization; T wave is ventricular repolarization; PR segment represents AV nodal delay.
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