Which human heart valves are closed during isovolumetric phase of ventricular systole?

Question

Which human heart valves are closed during isovolumetric phase of ventricular systole...and why is this phase so important in the cardiac cycle?

Thanku

Answer 1

ventricular systole in the ventricular contraction meaning blood is leaving the chambers through the aorta and the pulmonary vein.  So it would be the semi lunar valves or aortic valves. and if u dont why its important u shouldnt be doin biology

Answer 2

If you dont know this then get out!