<prompt> Isovolumic relaxation phase of the cardiac cycle ends with :Peak of C wavesOpening of A.V. valveClosure of semilunar valveBeginning of wave.  <response>: B i.e. Opening of A.V. value Valvular event valves Cardiac events ECG JVP Jugular venous Pressure curve Opening of AV End of End of T V-Y descentQ valveQ isovolumic relaxation phaseQ waveQ phase bw T wave and new p wave Closure of AV -End of diastole Later half of End of x valve - Beginning of isovolumic contraction R wave descent Opening of semilunar valve End of isovolumic contractionQ ST segment Peak of C wave Closure of - Beginning of Later half of semilunar valve isovolumic relaxation T wave Phase - Beginning of diastole 