A(n) _____ is a recording electrical changes occurring in the myocardium during

Question

A(n) _____ is a recording electrical changes occurring in the myocardium during a cardiac cycle. The P wave corresponds to depolarization of the muscle fibers of the _____ The QRS complex corresponds to depolarization of the muscle fibers of the _____ The T wave corresponds to repolarization of the muscle fibers of the _____ Why is atrial repolarization not observed in the ECG? _____ Identify the heart chambers and conduction system structures in the frontal section of the heart in figure 45.7. _____

Explanation / Answer

4. Electrocadiogram.

It is the graphic representation of electric events produced by the excitation of cardiac muscles during a cardiac cycle.

5. Auricles.

P wave represents development of action potential in SA node causing atrial depolarization leading to contraction of both atria.

6. Ventricles.

QRS complex represents Combined depolarization of ventricles and repolarization of auricles leading to contraction of ventricles and relaxation of auricles.

7. Atrial repolarization is not visible ,as it is obscured by large QRS depolarization of ventricles occurring at that time.

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