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Valve separating the compartments

Specify the first heart chamber in which the blood enters? Where does blood go after passing that particular chamber? What is the name of valve which separates the compartments? Why is that valve essential?

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Venous blood which comes from tissues reaches the right atrium of heart. From there, the blood goes to right ventricle. The valve which divides the right ventricle from the right atrium is tricuspid valve. The tricuspid valve is essential in order to prevent the returning of blood to right ventricles.

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