Cardiac Cycle

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  • Created by: Eema003
  • Created on: 15-05-16 15:02
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  • Cardiac Cycle
    • The Atria and ventricles are relaxed and emptied
      • Blood at low pressure enters the atria
        • As they fill up the blood pressure in the atria increases
          • When the pressure exceeds that of the ventricles blood flows through the atrioventricular valves into the ventricles
            • The Atria Contract
              • The contraction empties the atria
                • The Ventricles contract almost immediately
                  • This increases the pressure in them above that in the pulmonary arteries and aorta
                    • Blood flows into the pulmonary arteries and the aorta
                      • The elastic walls of the aorta stretch to accommodate the blood
                        • The Ventricles and atria relax
                          • The pressure in the ventricles is now less than in the pulmonary arteries and the aorta
                            • The backflow of blood is prevented by the semi-lunar valves

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