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During atrial diastole, blood flows passively from the atria to fill their respective ventricles to prepare for systole. During atrial systole, atria contract completing ventricular filling. What is happening during these phases?Choose all that apply to phases 1 and 2 of the cardiac cycle.-Atria contract to force the remaining blood into the ventricles.-Atrioventricular (AV) valves are open.-Blood flows passively from veins through atria into ventricles.-Semilunar valves are open.-Pressure in both atria and ventricles is high.

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