Bicuspid and tricuspid valves open when:
- ABlood flows from the right ventricle and left ventricle into the pulmonary artery and aorta,respectively.
- BBlood flows from the pulmonary vein and vena cava into the left and right atria,respectively.
- CBlood flows from the right and left atria into the right and left ventricles,respectively.
- DNone of these.
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