2. Cardiac Conduction System

3. Sinoatrial (SA) node

4. Atrioventricular (AV) node

5. Antrioventricular (AV) Bundle (Bundle of His)

6. Right bundle branch

7. Left bundle branch

8. Purkinje Fibers

9. EKG = ECG = electrocardiogram

10. Leads (limb leads)

11. P wave Atrial Depolarization

12. QRS complex Ventricular Depolarization

13. T wave Ventricular Repolarization

14. Depolarization

15. Repolarization

16. Bradycardia Resting heart rate under 60 bpm

17. Tachycardia Heart rate exceeds 100 bpm

18. Fibrillation Rapid, irregular, and unsynchronized contraction of muscle fibers