Describe the Cardiac cycle (atrial systole, ventricular systole and diastole). (Activity 1.7)

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Cardiac Cycle:


  • Atrial and ventricular diastole Blood flows into the atria.
  • Elastic recoil of the atrial walls generates low pressure in the atria, helping to draw blood into the heart. Initially the atrioventricular valves are open/closed.
  • As the ventricles begin to relax, blood tends to fall back from the aorta and pulmonary artery causing the semi-lunar valves to close.
  • This causes the second…


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