Diastole

 

This is the name given to the relaxation of the heart after its contraction called systole. It is passive and is caused by the opening of the atrioventricular valves (mitral, tricuspid). It is accompanied firstly by the second heart sound at the closure of the aortic and pulmonary valves. This coincides with opening of the atrioventricular valves and then a rapid reduction in atrial and ventricular pressures. There then follows a sustained increase in ventricular volume due to the phenomenon called rapid filling of the ventricles. All the above are megaevents of the cardiac cycle.

       

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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1 isovolumetric contraction 2 ejection 3 isovolumetric relaxation 4 rapid inflow 5 diastasis 6 atrial systole  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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