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What is Isovolumic relaxation phase of the cardiac cycle ends with and explain in detail?
Cardiac cycle events
1.    AV valves open – 
a.     End of isovolumetric relaxation
b.    Start of rapid filling phase
c.     ECG- end of T wave
d.    JVP- Y wave (V-Y descent)
2.    AV valves closure-
a.     End of diastole
b.    Beginning of isovolumetric contraction
c.     ECG- R wave later half
d.    JVP- End of X descent
3.    Semilunar valves open
a.     End of isovolumetric contraction
b.    Ejection phase starts
c.     ECG- ST segment
d.    JVP- the peak of ‘c’ wave
4.    Semilunar valve closure
a.     Systole ends
b.    Isovolumetric relaxation starts
c.     ECG- T wave later half