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What is vena cava

What do you mean by the term vena cava? Explain the type of blood which circulates inside the vena cava?

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The vena cava is either of the two large veins which debouch into the right atrium. The superior vena cava drains all blood that comes from the head, the superior limbs, the neck and the superior portion of the trunk. The inferior vena cava carries blood drained from the inferior portion of the trunk and the inferior limbs. Venous blood circulates within the vena cava.

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