The opening of the post caval vein into the r | vedclass

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(D) The post caval vein, also known as the $Inferior Vena Cava$, carries deoxygenated blood from the lower parts of the body to the right atrium of th

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Eustachian valve

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(D) The post caval vein, also known as the $Inferior Vena Cava$, carries deoxygenated blood from the lower parts of the body to the right atrium of the heart. At the point where the $Inferior Vena Cava$ enters the right atrium, there is a fold of the endocardium known as the $Eustachian valve$. This valve prevents the backflow of blood into the vein during the contraction of the atrium in the embryonic stage, though it becomes non-functional in adults.

The opening of the post caval vein into the right atrium is guarded by which of the following?

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