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1. All of the following are components of the cardiac conduction system except:
A. sinoatrial node
B. interatrial septum
C. internodal tracts
D. atrioventricular node

2. Which coronary artery supplies oxygenated blood to the sinoatrial node and the atrioventricular
node?
A. right coronary artery
B. left anterior descending
C. circumflex
D. left main

3. Which of the following components of the cardiac conduction system is considered the
pacemaker of the heart?
A. internodal tracts
B. bundle of His
C. atrioventricular node
D. sinoatrial node

4. The sinoatrial node is located closest to the:
A. superior vena cava
B. coronary sinus
C. right coronary artery
D. inferior vena cava

5. The sinoatrial node normally fires electrical impulses at a rate of:
A. 40 to 60 per minute
B. 20 to 40 per minute
C. 60 to 100 per minute
D. 10 to 20 per minute

6. The His bundle has an automatic firing rate of between:
A. 60 to 100 per minute
B. 20 to 40 per minute
C. 0 to 10 per minute
D. 40 to 60 per minute

7. The Purkinje fibers have an automatic firing rate of between:
A. 60 to 100 per minute
B. 40 to 60 per minute
C. 0 to 10 per minute
D. 20 to 40 per minute

8. Which of the follow ing components of the cardiac conduction system delivers the electrical
impulse from the sinoatrial node to the atria?
A. bundle of His
B. internodal tracts
C. atrioventricular node
D. bundle branches

9. Which of the following deliver the electrical impulse from the sinoatrial node to the left atrii
A. His
B. Wenkebach
C. Bachmann's
D. Bernoulli's

10. Which of the following components of the cardiac conduction system deliver the electric
impulse to the bundle of His after a 0.10 second delay?
A. bundle of His
B. sinoatrial node
C. atrioventricular node
D. internodal tracts

11. The atrioventricular node is located at the floor of the:
A. left atrium
B. right atrium
C. left ventricle
D. right ventricle

12. Which of the following components of the cardiac conduction system deliver the electrical
impulse from the atrioventricular node to the bundle branches?
A. atrioventricular node
B. bundle of His
C. Purkinje fibers
D. internodal tracts

13. Which of the following components of the cardiac conduction system delivers the electrical
impulse from the bundle of His to the ventricles?
A. internodal tracts
B. right'left bundle branches
C. His bundle
D. sinoatrial node

14. Which of the following components of the cardiac conduction system delivers the electrical
impulse from the bundle branches to the ventricular walls?
A. sinoatrial node
B. bundle of His
C. atrioventricular node
D. Purkinje fibers

15. Which of the following terms means the heart can begin and maintain rhythmic activity without
the aid of the nervous system?
A. excitabilty
B. contractility
C. conductivity
D. automaticity

16. Which of the following terms means that cardiac muscle can accept and respond to electrical
impulses?
A. excitability
B. automaticity
C. conductivity
D. contractility

17. Which of the following terms means that a cardiac cell is able to transfer an electrical impulse
to a neighboring cardiac cell?
A. excitability
B. automaticity
C. contractility
D. conductivity

18. Which of the following terms means that the heart responds to an electrical impulse by-
contracting?
A. conductivity
B. automaticity
C. contractility
D. excitability