Question

The middle and largest deflection wave in a normal ECG is the ________?

1) P wave
2) QRS complex
3) T wave
4) U wave

Answer 1

The middle and largest deflection wave in a normal ECG is the QRS complex, which represents the depolarization of the ventricles.

Step-by-step explanation:

The middle and largest deflection wave in a normal ECG is the QRS complex. It represents the depolarization of the ventricles, which is a significantly large and strong electrical signal due to the larger size of the ventricular cardiac muscle. When looking at a normal ECG tracing, the distinct P wave signifies the depolarization of the atria, followed by the QRS complex indicating the depolarization of the ventricles, and ending with the T wave, which represents the repolarization of the ventricles. Atrial repolarization also occurs but is masked by the QRS complex on the ECG.