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08-01-2024
Health

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ECG: The QRS complex marks the firing of the AV node and represents ventricular depolarization. The Q wave corresponds to depolarization of the interventricular septum. R wave is produced by depolarization of the main mass of the ventricles. S wave represents the last phase of ventricular depolarization at the base of the heart. Atrial repolarization also occurs during this time but the signal is obscured by the large QRS complex. Which wave represents the last phase of ventricular depolarization at the base of the heart?
1) Q wave
2) R wave
3) S wave
4) T wave

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