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vena cava
The superior an inferior vena cava are collectively called the venae cavae. They are the veins that return deoxygenated blood from the body into the heart. They both empty into the right atrium.
Trivia about vena cava
You have a superior one of these veins, as well as an inferior one
Blood enters the right atrium of the heart through these two veins, one superior, the other inferior
(Sarah of the Clue Crew points to a diagram of the heart on the monitor.) Deoxygenated blood is carried back to the heart via the body's two largest veins, the superior & inferior this