Tricuspid valves

Could anyone tell me what the difference between tricuspid valve and bicuspid valve ( in function ) is, please ? I don't think those two valves are 'created' differently just for fun. What i think is the tricuspid valve is easier to open, ...

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the main valves r present between the atria & the ventricles the one between the right atria & right ventricle is the tricuspid valve & the one between the left atria & left ventricle is the bicuspid valve actually ...

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