During which cardiac phase does blood move into the heart due to compression recoil?

• A. Atrial Systole
• B. Ventricular Diastole
• C. Compression Recoil
• D. Isovolumetric Contraction

Answer: (C)

During ventricular diastole, the ventricles relax and their walls elastically recoil, causing a drop in intraventricular pressure. That pressure fall creates a gradient from the atria to the ventricles, so blood flows through the open AV valves into the ventricles. The rapid filling phase in early diastole is driven by this recoil and relaxation. While the term “compression recoil” isn’t a standard label for a phase, it describes the elastic rebound of the ventricle that helps pull blood in. Other phases, like isovolumetric contraction, isovolumetric relaxation, and ventricular ejection, aren’t about inflow into the ventricles.