Bicuspid and tricuspid valves open when:

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(C) The bicuspid (mitral) and tricuspid valves are atrioventricular valves. These valves open when the pressure in the atria exceeds the pressure in t

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Blood flows from the right and left atria into the right and left ventricles,respectively.

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(C) The bicuspid (mitral) and tricuspid valves are atrioventricular valves. These valves open when the pressure in the atria exceeds the pressure in the ventricles,allowing blood to flow from the right and left atria into the right and left ventricles,respectively. Once the ventricles begin to contract,the pressure inside them rises,causing these valves to close to prevent the backflow of blood into the atria.

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