During which phase of the cardiac cycle does ventricular pressure rise but ventricular volume remain constant?

Question

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[Chapter 3, V; Figure 3.15]. Because the ventricles are contracting during isovolumetric contraction, ventricular pressure increases. Because all of the valves are closed, the contraction is isovolumetric. No blood is ejected into the aorta until ventricular pressure increases enough to open the aortic valve.

During Which Phase of the Cardiac Cycle Does Ventricular Pressure