Physiology – MCQ 82 – Valvular events in cardiac cycle

During the cardiac cycle the opening of the aortic valve takes place at the :
A. Beginning of systole
B. End of isovolumetric contraction
C. End of diastole
D. End of diastasis

Correct answer : B. End of isovolumetric contraction

Valvular events in cardiac cycle:

• Atrio-ventricular valves close at the end of diastole
• Semilunar valves open at the end of isovolumetric contraction phase
• Semilunar valves close at the end of systole
• Atrio-ventricular valves open at the end of isovolumetric relaxation phase