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• Isovolumetric means that blood volume does not change.
• Ventricular blood volume and cell length remain constant.
• With valves closed and contraction continuing, ventricular pressure continues to rise.
• Ventricular pressure rises above arterial pressure.
• Increased ventricular pressure overcomes the arterial pressure and semilunar valves open.
• Blood is ejected into the arteries, decreasing ventricular volume.
• Ventricular repolarization (T wave) marks the end of ventricular contraction.
• Ventricular pressure begins to decrease.
• Initiated by repolarization of ventricular muscle cells.
• Pressure in relaxing ventricle drops below arterial pressure.
• SL valves are pushed closed by arterial pressure.
• Dicrotic wave is produced when closure of the valves produces local pressure changes.
• With all valves closed, blood volume does not change.
• As the ventricle relaxes, ventricular pressure falls quickly.
• Atrial pressure is greater than pressure in relaxing ventricles and AV valves open.
• As the valves open the ventricles begin filling with blood.
• Ventricular volume fills in about 0.2 seconds.
• Atrial depolarization (P wave) will trigger atrial contraction, and a new cardiac cycle begins.
