This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
During cardiac cycle opening of the aoic valve takes place at 
Select and explain. 
A. Beginning of systole, B. End of isovolumetric contraction, C. End of diastole, D. End of diastasis
B: End of isovolumetric contraction
Answer: B: End of isovolumetric contraction 
Explanation: 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 ed/page 540