<prompt> During cardiac cycle opening of the aoic valve takes place atBeginning of systoleEnd of isovolumetric contractionEnd of diastoleEnd of diastasis  <response>: At the end of the Isovolumetric contraction, aoic and pulmonary valves open so that the ventricles can eject blood into the aoa and pulmonary trunk Ref: Ganong 25th edpage 540 