1.2.2 inititiation of cardiac cycle


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  • The SAN located in the right atria sends a wave of depolarisation to the AVN.
  • The wave of depolarisation is delayed to allow the atria to contract.
  • The wave of depolarisation goes down the bundle of his.
  • the bundle of his seperates in to the right and left ventricular walls.
  • The wave of depolarisation is carried by the purkinye fibers.
  • Contraction starts at the bottom and up - away from the apex
  • This results in a strong unison contraction
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