Final answer:
The phase of the cardiac cycle that is described as early diastole, prediastole, or prodiastole is called ventricular diastole.
Step-by-step explanation:
The phase of the cardiac cycle that is described as early diastole, prediastole, or prodiastole is called ventricular diastole. This phase occurs when the ventricles are relaxed and filling with blood. It is important for the ventricles to relax and fill adequately to ensure efficient pumping of blood to the body.