1. The Cardiac Conduction System continued…

2. Review Discuss with the person next to you and see if you can remember what the myocardium is? Ok, now what about action potential?

3. SA Node The impulse starts here. Atrial fibers depolarize. This causes the P wave. This will lead to the contraction of the atria…

4. AV Node Once the impulse reaches the ventricular fibers, they rapidly depolarize. Walls are thicker = electrical charge is greater. This mark is called the QRS complex. Consists of a Q wave, an R wave, and an S wave. Next will be the contraction of the ventricular walls…

5. Ending Electrical charges created during ventricular muscle fibers depolarization slowly produce T wave. Pattern complete.

6. Atrial repolarization? Is not seen because masked by QRS wave.