The Bicuspid Valve is much like the Tricuspid Valve. It allows blood to flow through into the ventricle, but prevents blood from entering back into the atrium. The difference is it only has two flaps instead of three.
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The bicuspid (or mitre) and tricuspid valves are valves controlling the blood flow in the heart. The tricuspid valve has three flaps, and bicuspid valve two. The tricuspid is located in between the right atrium and the right ventricle.
The mitral valve (bicuspid) and the tricuspid valve are atrioventricular valves. These two valves prevent the backflow of blood into the atria during contraction of the ventricles. When the ventricles are relaxed, the cusps of the AV valves hang limply into the ventricular chambers while blood flows into the atria and down through the open AV valves into the ventricles. When the ventricles start to contract, the pressure within them rises and forces the blood superiorly against the valve cusps, pushing the edges of the cusps together and closing the AV valves.