In mammals,which valve guards the opening of | vedclass

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(C) The posterior vena cava (inferior vena cava) enters the right atrium of the mammalian heart.This opening is guarded by a fold of the endocardium k

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Eustachian valve

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(C) The posterior vena cava (inferior vena cava) enters the right atrium of the mammalian heart.This opening is guarded by a fold of the endocardium known as the $Eustachian$ $valve$.This valve is functional during embryonic development to direct oxygenated blood from the inferior vena cava towards the foramen ovale,but it becomes non-functional or vestigial in adults.

In mammals,which valve guards the opening of the posterior vena cava into the right atrium?

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