Cardiac cycle

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Systole: Artiral systole

SYSTOLE: contraction

The atria contracts pushing the remaining blood into the ventricles

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Systole: Ventricular

SYSTOLE: Contraction

  • There is a short delay to allow the ventricles to fill
  • The pressure increases in the ventricles causing the atrioventricular valves to shut
  • And so, this causes the semi-lunar valves to open
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DIASTOLE: Relaxation

  • Blood returns to the atria by the vena cava and pulmonary vein
  • The atria fills up, and increases the pressure
  • This causes the atrioventricular valve to open
  • Blood then moves into the ventricles
  • The ventricle walls are relaxed which results in a lowered pressure in the ventricles, a lower pressure in the aorta and pulmonary artery resulting in the semi-lunar valve to shut
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