The first phase of diastole is called the atrial kick,and it is the phase during which the atria fill with blood from the ventricles.

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Quizplus · Accepted Answer

The first phase of diastole is when the ventricles relax and fill with blood from the atria, but the "atrial kick" refers to the final part of diastole where the atria contract to push additional blood into the ventricles, not from the ventricles.

The First Phase of Diastole Is Called the Atrial Kick,and