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Vena Cava-Function and definition. Vena Cava are the two largest veins in human body together called the venae. These veins collectively return deoxygenated BLOOD to the HEART. Both of them deplete all the blood into the right atrium.The superior vena cava, large but short vein, brings blood from the upper part of the organism, the head and upper limbs, and empties into the top of the right atrium.he superior vena cava, large but short vein, brings blood from the upper part of the organism, the head and upper limbs, and empties into the top of the right atrium.
Answers. Best Answer: The superior vena cava and the inferior vena cava both enter the heart at the right atrium. The difference is that-as the name suggests-the superior vena vava carried deoxygenated blood back to the heart from the upper areas of the body (in Latin, superior == above).imilalry, the inferior vena cava carried deoxygenated blood from the lower regions of the body back to the heart (in Latin, 'inferior' == lower).