2313

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Author:
hoalan
ID:
173971
Filename:
2313
Updated:
2012-09-27 20:33:01
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4A1
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4A1
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  1. 1. All of the following are components of the cardiac conduction system except:
    a. sinoatrial node
    b. internodal tracts
    c. interatrial septum
    d. atrioventricular node
    C
  2. 2. Which coronary artery supplies oxygenated blood to the sinoatrial node and the atrioventricular
    node?
    a. left main
    b. left anterior descending
    c. circumflex
    d. right coronary artery
    D
  3. 3. Which of the following components of the cardiac conduction system is considered the
    pacemaker of the heart?
    a. sinoatrial node
    b. internodal tracts
    c. atrioventricular node
    d. bundle of His
    A
  4. 4. The sinoatrial node is located closest to the:
    a. superior vena cava
    b. inferior vena cava
    c. coronary sinus
    d. right coronary artery
    A
  5. 5. The sinoatrial node normally fires electrical impulses at a rate of:
    a. 60 to 100 per minute
    b. 40 to 60 per minute
    c. 20 to 40 per minute
    d. 10 to 20 per minute
    A
  6. 6. The His bundle has an automatic firing rate of between:
    a. 60 to 100 per minute
    b. 40 to 60 per minute
    c. 20 to 40 per minute
    d. 0 to 10 per minute
    B
  7. 7. The Purkinje fibers have an automatic firing rate of between:
    a. 0 to 10 per minute
    b. 20 to 40 per minute
    c. 40 to 60 per minute
    d. 60 to 100 per minute
    B
  8. 8. Which of the follow ing components of the cardiac conduction system delivers the electrical
    impulse from the sinoatrial node to the atria?
    a. internodal tracts
    b. atrioventricular node
    c. bundle of His
    d. bundle branches
    A
  9. 9. Which of the following deliver the electrical impulse from the sinoatrial node to the left atrii
    a. Bachmann's
    b. Bernoulli's
    c. Wenkebach
    d. His
    A
  10. 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. sinoatrial node
    b. internodal tracts
    c. atrioventricular node
    d. bundle of His
    C
  11. 11. The atrioventricular node is located at the floor of the:
    a. left atrium
    b. right atrium
    c. right ventricle
    d. left ventricle
    B
  12. 12. Which of the following components of the cardiac conduction system deliver the electrical
    impulse from the atrioventricular node to the bundle branches?
    a. internodal tracts
    b. atrioventricular node
    c. bundle of His
    d. Purkinje fibers
    C
  13. 13. Which of the following components of the cardiac conduction system delivers the electrical
    impulse from the bundle of His to the ventricles?
    a. sinoatrial node
    b. internodal tracts
    c. His bundle
    d. right'left bundle branches
    D
  14. 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. atrioventricular node
    c. bundle of His
    d. Purkinje fibers
    D
  15. 15. Which of the following terms means the heart can begin and maintain rhythmic activity without
    the aid of the nervous system?
    a. automaticity
    b. excitabilty
    c. conductivity
    d. contractility
    A
  16. 16. Which of the following terms means that cardiac muscle can accept and respond to electrical
    impulses?
    a. automaticity
    b. excitability
    c. conductivity
    d. contractility
    B
  17. 17. Which of the following terms means that a cardiac cell is able to transfer an electrical impulse
    to a neighboring cardiac cell?
    a. automaticity
    b. excitability
    c. conductivity
    d. contractility
    C
  18. 18. Which of the following terms means that the heart responds to an electrical impulse by-
    contracting?
    a. automaticity
    b. excitability
    c. conductivity
    d. contractility
    D

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