The Cardiac Cycle

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  • Created by: lauren
  • Created on: 06-11-12 13:04

Atrial Systole

  • Atria contact
  • This increases blood pressure in the atria
  • Blood pressure in the atria is greater than that in the ventricles
  • The pressure difference forces open the atrio-ventricular valves
  • Blood moves from the atria into the ventricles
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Ventricular Systole

  • Ventricles contract
  • This increases the blood pressure in the ventricles
  • Blood pressure in the ventricles is greater than that in the atria
  • The pressure difference forces the atrio-ventricular valves to close
  • Blood pressure in the ventricles  is greater than that in the arteries
  • The pressure difference forces the semi-lunar valves to open
  • Blood moves from the ventricles into the arteries
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Diastole

  • Ventricles relax
  • This decreases blood pressure in the ventricles
  • Blood pressure in the arteries is greater than that in the ventricles
  • The pressure difference forces the semi-lunar valves to close
  • Blood pressure in the ventricles is lower than that in the atria
  • Atrio-ventricular valves fall open
  • Blood trickles from the atria into the ventricles
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Comments

mariah

thank you **

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