Trivia: The Cardiovascular System Quiz!

26 Questions | Total Attempts: 30

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Trivia: The Cardiovascular System Quiz!

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Questions and Answers
  • 1. 
    Cardiac muscle cells are connected to adjacent cardiac muscle cells by junctions called __________.
  • 2. 
    Cardiac muscle fibers are interconnected in branching networks that spread in all directions of the heart to form a ______ which is a mass of merging cardiac muscle cells.
  • 3. 
    The heart contains two functional syncytia. They are the _________ which is located in the atrial walls and the _______ which is located in the ventricular walls. If any part of the syncytium is stimulated, the whole structure contracts as a unit.
  • 4. 
    Except for a small region in the floor of the _______, the atrial syncytium is separated from the ventricular syncytium by the _______________.
  • 5. 
    The _________ is a network of specialized cardiac muscle cells that initiates and distributes electrical impulses.
  • 6. 
    Most of the specialized cardiac muscle cells involved in the cardiac conduction system are smaller than the _________ of the myocardium and contain fewer ________. Instead of contracting they initiate and distribute the _____________.
  • 7. 
    The conduction system of the heart includes the _____ which is a small mass of specialized cardiac muscle cells situated on the posterior wall of the right atrium just below the opening of the superior vena cava beneath the epicardium.
    • A. 

      A-V node

    • B. 

      Pacemaker

    • C. 

      S-A node

    • D. 

      Atrial synctium

  • 8. 
    The fibers of the S-A node are continuous with those of the __________.
  • 9. 
    The S-A node is referred to as the _________ of the heart.
  • 10. 
    The S-A node contains pacemaker cells which establish the __________. It is responsible for the ________ of the heart.
  • 11. 
    The S-A node initiates one impulse after another _____ times per minute
    • A. 

      50-60

    • B. 

      60-70

    • C. 

      70-80

    • D. 

      80-90

    • E. 

      90-100

  • 12. 
    As the cardiac impulse travels from the S-A node into the __________, the atria _______ almost simultaneously.
  • 13. 
    _________ are fibers that are interspersed amongst the atrial muscle fibers that conduct the impulses to the A-V node.
    • A. 

      Purkinje fibers

    • B. 

      Myofibrils

    • C. 

      Contractile fibers

    • D. 

      Junctional fibers

    • E. 

      S-A fibers

  • 14. 
    Junctional fibers have very _____ diameters that cause the impulses they carry to be ________.
  • 15. 
    The _______ is a mass of specialized cardiac muscle cells located in the lower right atrium near the entrance of the coronary sinus.
    • A. 

      S-A node

    • B. 

      Auricle

    • C. 

      A-V node

    • D. 

      Bundle branches

    • E. 

      Myofibril

  • 16. 
    The A-V node provides the only normal _____________ between the atrial and ventricular syncytia.
  • 17. 
    The ____________ does not conduct impulses and thus isolates the atrial myocardium from the ventricular myocardium.
  • 18. 
    The cells composing the A-V node are ______ efficient in conducting an impulse which causes a short delay in the transmission of the impulse to the_________.
  • 19. 
    What is the importance of the A-V node?
    • A. 

      It permits the ventricles to complete their contraction and empty their blood into the pulmonary trunk and aorta

    • B. 

      It helps to close the A-V valves

    • C. 

      It has no real significance

    • D. 

      It permits the atria to complete their contraction and empty their blood into the ventricles before they contract

    • E. 

      It conducts electrical impulses to the purkinje fibers

  • 20. 
    Once the cardiac impulse reaches the distal end of the A-V node, it passes into a group of large fibers that make up the __________. This bundle is located in the superior portion of the ____________ where impulses travel __________.
  • 21. 
    The A-V bundle persists only briefly before dividing into the _____ and ______ bundle branches. These branches extend toward the _____ of the heart in the _________.
  • 22. 
    The bundle branches conduct the cardiac impulse to the ___________.
  • 23. 
    The purkinje fibers are very _____ fibers, essentially long strands of _____-shaped cells with few ______. They are located in the _________.
  • 24. 
    Purkinje fibers complete the conduction pathway through the __________, penetrate into the _____ and then travel ____ into the __________. They give off many small paths and become continuous with the _____________.
  • 25. 
    Purkinje fibers conduct impulses very _________; as fast as _____________.