Physiology Opening of the aoic valve takes place during which of the following phase of the cardiac cycle? A Beginning of isovolumetric contraction B End of isovolumetric contraction C During protodiastole D At the end of diastasis 💡 Explanation Opening of the aoic valve takes place during which of the following phase of the cardiac cycle? ✓ Correct Answer: B. End of isovolumetric contraction