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Transcript

Electrical Conductivity of the Heart

Gareth Williams

teaching methods used

  • direct teach
  • assessment
  • kolbs learning by doing

Points covered

  • Explain the parts of the heart
  • Understand starlings law
  • Understand the electrical pathway through a heart
  • Understand how the heart beat is controlled by the electrical pathway

Learning outcomes

  • Explain the parts of the heart
  • Understand starlings law
  • Understand the electrical pathway through a heart
  • Understand how the heart beat is controlled by the electrical pathway

Sino-atrial node

  • located in the right atria
  • The natural pace maker of the heart
  • intrinsic rate of 100 bpm
  • Influenced by the sympathetic and parasympathic nervous sytems

Bundle of His

  • Acts as conduction pathway to stop premature contraction of the ventricles
  • Fires at a rate of 20-40 bpm
  • splits into the left and right bundle branches

Anterioventricular Node

  • located at the junction of the septum and the atria
  • Has an intrinsic firing rate of 40-60
  • Delays conduction by 0.12 seconds
  • Allows atria to to fully contract and empty before the ventricles contract

purkinje fibers

  • located throughout the apex of the heart
  • Acts as the interface between the electrical pathway and the myocardium
  • firing rate of 15-40 bpm
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