1. Normally, the _________
node serves as the pacemaker of the heart.
2. The _______
node is located in the inferior portion of the interatrial septum.
3. The fibers that carry cardiac impulses from the interventricular septum into the myocardium are called ________
fibers.
4. A(n) ______ is a recording of electrical changes occurring in the myocardium during a cardiac cycle.
5. The P wave corresponds to depolarization of the muscle fibers of the ______
6. The QRS complex corresponds to depolarization of the muscle fibers of the ______
7. The T wave corresponds to repolarization of the muscle fibers of the ________
8. Why is atrial repolarization not observed in the ECG?