Reflex diastole, also known as the diastolic reflex, refers to the relaxation or expansion phase of the heart's cardiac cycle. Synonymous terms to describe this crucial phase include ventricular diastole, cardiac diastole, or simply diastole. During reflex diastole, the heart's ventricles relax and fill with blood, preparing for the subsequent contraction phase, systole. Other akin expressions for reflex diastole may include the heart's period of rest, diastolic relaxation, or ventricular relaxation. Understanding and monitoring the duration and efficiency of reflex diastole is essential in assessing cardiovascular health and functioning. Overall, synonyms for the term "reflex diastole" encompass various phrases portraying the relaxation and preparation of the heart before its next contraction.