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The Cardiac Cycle
AS Level Edexcel

Stage 1: Atrial Systole

(Ventricles are relaxed) The atria contract, decreasing the volume of
the chamber and increasing the pressure inside the chamber
This pushes the blood into the ventricles.

There is a slight increase in ventricular pressure and chamber
volume as the ventricles…

Page 2

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Blood returns to the heart and the artia fill again due to the higher
pressure in the vena cava and pulmonary vein. This starts to
increase the pressure of the atria.

As the ventricles continue to relax, their pressure falls below the
pressure of the atria and the atrioventrivular valves…


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