During isovolumetric ventricular contraction which do the following do: increase, decrease, or do not change?

During isovolumetric ventricular contraction which do the following do: increase, decrease, or do not change?
There are 3 phases in the cardiac cycle:
the cardiac cycle: 1) Ventricular filling: mid-to-late diastole; 2) Ventricular systole; and 3) Isovolumetric relaxation: early diastole. In phase two, ventricular systole, the atria relax and the ventricles begin contracting. Their walls close in on the blood in their chambers, and ventricular pressure rises closing the atriaventricular (AV) valve. Because, for a split second, the ventricles are completely closed chambers and blood volume in the chambers remain constant, it is called the isovolumetric contraction phase.

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Orignal From: During isovolumetric ventricular contraction which do the following do: increase, decrease, or do not change?