Conduction System (Mammalians)

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Author:
DesLee26
ID:
202150
Filename:
Conduction System (Mammalians)
Updated:
2013-02-20 17:59:02
Tags:
BIO 220 Test Two
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Description:
Circulatory System
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  1. All muscle is innervated by __.
    nerves
  2. Explain nerves in terms of muscles.
    •                                                               i.      Smooth and skeletal muscle will not contract unless the nerves stimulate them
    •                                                             ii.      Although cardiac muscle has innervation, the nervous system doesn’t control the contractions; that is the job of the conduction system of the heart
    • 1.      Autonomic speeds up or slows down the heart rate
  3. What are the conduction systems responsible for?
    a.      Responsible for the rhythmic contraction of the chambers and its made up of specialized cardiac muscle cells that act like neurons in that they can stimulate the rest of the cardiac muscle (myocardium) to contract 
  4. True or False:
    The conduction system is the contraction cycle.
    a.      IT IS NOT THE CONTRACTION CYCLE; IT IS RESPONSIBLE FOR THE CONTRACTION CYCLE
  5. Explain the SA node
    •                                                               i.      Normal pacemaker
    •                                                             ii.      Regulates heartbeat
    •                                                           iii.      Doesn’t need a stimulus
  6. What happens when the SA gets triggered?
    • 1.      sends info down interatrial fiberes to AV node
    • a.      When down there, the whole atrial muscle mass gets stimulated to contract
    •                                                                                                                                       i.      While that’s contracting, the stimulation is moving down the Bundles of His and up the Perkinje fibers
    • 1.      Not until it’s at the Perkinje fibers that the ventricles get excited
    • a.      Excitation at this point has passed over atria
  7. Excitation of cardiac conduction system in terms of atria and ventricles.
    •                                                                                                                                                                                                               i.      NOT EXCITED AT SAME TIME
    •                                                                                                                                                                                                             ii.      ATRIAL EXCITATION, THEN VENTRICULAR EXCITATION
  8. What are hte parts of the cardiac conduction system?
    • a.      SA Node
    • b.      Interatrial Fibers
    • c.       Atrioventricular Node
    • d.      Bundles of His
    • e.       Perkinje Fibers
  9. Explain the atrioventricular node.
    •                                                               i.      Can act as alternate pacemaker, but it’s a slower beat
    •                                                             ii.      In floor of right atrium
  10. Explain the Bundles of His
                                                                  i.      Fibers that are in the introventricular septum
  11. What are the components of hte conduction system in the left atrium?
    there are no components of conduction system in left atrium

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