Question at position 10 Which portion of the ECG wave corresponds to the repolarization of Purkinje fibres in the ventricles?P waveQ waveR waveS waveT wave单项选择题
A
P wave
B
Q wave
C
R wave
D
S wave
E
T wave

Question

Question at position 10 Which portion of the ECG wave corresponds to the repolarization of Purkinje fibres in the ventricles?P waveQ waveR waveS waveT wave

BlackTom AI · Accepted Answer

Question restatement: The prompt asks which portion of the ECG wave corresponds to the repolarization of Purkinje fibres in the ventricles, with the options: P wave, Q wave, R wave, S wave, T wave.
Option 1: P wave. The P wave represents atrial depolarization, not ventricular repolarization. It occurs before the ventricles contract and is generated by the atrial myocardium.
Option 2: Q wave. The Q wave is the initial downward deflection of the QRS complex and reflects the initial depolarization of the interventricular septum, not repolarization of Purkinje fibers.
Option 3: R wave. The R wave is the first positive deflection in the QRS complex and corresponds to ventricular depolarization, specifically the main mass of ventricular muscle, rather than repolarization.
Option 4: S wave. The S wave is the downward deflection following the R wave within the QRS complex and also relates to ventricular depolarization. It does not represent ventricular repolarization.
Option 5: T wave. The T wave represents ventricular repolarization. Although Purkinje fibers contribute to the overall ventricular conduction and repolarization processes, the T wave is the ultrasound of repolarization of the ventricles as a whole, including the purkinje-activated ventricular myocardium.
In summary, among the provided choices, the T wave is the component associated with ventricular repolarization, which includes the repolarization of the Purkinje-activated ventricular fibers. Other options correspond to atrial activity or to depolarization events within the ventricles rather than their repolarization.

Question at position 10 Which portion of the ECG wave corresponds to the repolarization of Purkinje fibres in the ventricles?P waveQ waveR waveS waveT wave单项选择题

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