 Problem
 Step 1
1) Ventricle filling. The AV valves open and blood flows onto the ventricles, causing ventricular pressure to rise and atrial pressure to fall.
Step 2
2) Isovolumetric contraction. The atrial repolarize, relax, and remain in diastole for the rest of the cardiac cycle.
Step 3
3) Ventricle ejection. The ejection of blood begins when ventricular pressure exceeds atrial pressure and forces the semi-lunar valves open. The pressure peaks at typically 120mm Hg in the left ventricle and 25mm Hg in the right.
Step 4
4) Isovolumetric relaxation. This is early ventricular diastole, when the T wave ends and the ventricles begins to expand.
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