Exploring the Heart's Electrical Pathways
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Questions and Answers

Which node generates impulses about 75 times per minute?

  • Atrioventricular node (AV node)
  • Purkinje fibers/plexus
  • Sinoatrial node (SA node) (correct)
  • Right bundle branch (RBB)

    • Which node delays the impulse approximately 0.1 second?

  • Sinoatrial node (SA node)
  • Atrioventricular bundle (AV bundle)
  • Atrioventricular node (AV node) (correct)
  • Left bundle branch (LBB)

    • Which pathway carries the impulse toward the apex of the heart?

  • Anterior internodal pathway
  • Bundle branches (correct)
  • Posterior internodal pathway
  • Middle internodal pathway

    • Which fibers carry the impulse to the heart apex and ventricular walls?

    <p>Purkinje fibers/plexus (C)</p> Signup and view all the answers

    What is the normal heart rate range for the Sinoatrial (SA) node?

    <p>60-100bpm (C)</p> Signup and view all the answers

    What is the normal heart rate range for the Atrioventricular (AV) node?

    <p>40-60bpm (D)</p> Signup and view all the answers

    Which node takes over as the pacemaker if the SA node is damaged?

    <p>AV node (D)</p> Signup and view all the answers

    What is the function of the AV node?

    <p>Delays the signal (C)</p> Signup and view all the answers

    Which fibers carry the signal to the ventricle muscle cells?

    <p>Purkinje fibers (A)</p> Signup and view all the answers

    Which artery supplies the AV node in 80% of people?

    <p>RCA (C)</p> Signup and view all the answers

    How many smaller tracts does the left bundle divide into near its origin?

    <p>Six (D)</p> Signup and view all the answers

    What is the function of the subendocardial branches of the AV bundle?

    <p>Stimulate the walls of the ventricles (B)</p> Signup and view all the answers

    Where is the sinu-atrial (SA) node located?

    <p>Anterolaterally just deep to the epicardium at the junction of the SVC and right atrium (B)</p> Signup and view all the answers

    How many times per minute does the SA node give off an impulse in most people most of the time?

    <p>70 (C)</p> Signup and view all the answers

    Which artery usually supplies the SA node?

    <p>Sinu-atrial nodal artery (B)</p> Signup and view all the answers

    Where is the atrioventricular (AV) node located?

    <p>Posteroinferior region of the interatrial septum near the opening of the coronary sinus (C)</p> Signup and view all the answers

    Which node distributes the signal to the ventricles through the AV bundle?

    <p>Atrioventricular (AV) node (D)</p> Signup and view all the answers

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