Cardiovascular System: Cardiac Conduction Terms

  1. sinoatrial node (SA node)
    the pacemaker; highly specialized neurological tissue, embedded in the wall of the right atrium, repsonsible for initiating electrical conduction of the heartbeat, causing the atria to contract and firing conduction of impulses to the AV node
  2. atrioventricular node (AV node)
    neurological tissue in the center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His
  3. bundle of His
    neurological fibers, extending from the AV node to the right and left bundle branches, that fire the impulse from the AV node to the Purkinje fibers
  4. Purkinje fibers (network)
    fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
  5. polarization
    resting; resting state of a myocardial cell
  6. depolarization
    change of a myocardial cell from a polarized (resting) state to a state of contraction
  7. repolarization
    recharging of the myocardial cell from a contracted state back to a resting state
  8. normal sinus rhythm (NSR)
    regular rhythm of the heart cycle stimulated by the SA node (average rate of 60 to 100 beats/minute)
Card Set
Cardiovascular System: Cardiac Conduction Terms
Quiz 3