EKG Chapter 3

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EKG Chapter 3
2010-11-01 19:19:11

EKG vocab
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  1. extracellular
    fluid and particles outside of and surrounding the cell
  2. intracellular
    Within a cell
  3. Electrolyte
    An ion or a small particle that is positively or negatively charged
  4. cellular membrane
    a layer of protein that surrounds a cell and keeps it separted from the surrounding fluid and cells
  5. sinoatrial node (SA node)
    the natural pacemaker of the heart, located in the upper part of the right atrium
  6. Depolarization
    a current, or a wave of electricity
  7. repolarization
    process of the ions returning to their original places
  8. morphology
    how the wave form looks, its shape and regulatiry.
  9. pacemaker
    SA node. electrical impulses that causes the heart to beat
  10. sinus rhythm
    the electrical impulses that originate from the SA node that create a waveform
  11. AV junction
    aread where the atrium and ventricle meet
  12. Bundle of His
    special conductive tissue in the middle of the septum of the heart. allows smooth and rapid conduction of the electrical impulse from the AV node to the ventricle
  13. Bundle branches
    special conductive tissue fibers that extend from the bundle of His and into the left and right ventricle
  14. Purkinje fibers
    confuction fibers that branch off from the bundle brances and deliver the electrical stimulus to the ventricles causing the ventricles to contract
  15. cardiac cycle
    the series of electrical and mechanical events that comprise each heart beat
  16. systole
    the period of time in which the heart muscle is contracting.
  17. diastole
    the period of time when the heart muscle is relaxed
  18. perfuse
    the forcing of blood into the surrounding tissues and organs by way of the blood vessels
  19. atrioventricular node (AV node)
    special conductive tissue located in the lower right atrium that conducts electrical impulses from the atria to the ventricles