The largest vein in the human body is the inferior vena cava.
The inferior vena cava is the vein that carries oxygenation blood
to the heart for oxygenation.
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The largest vein in the human body is the inferior vena cava,
the vein that returns blood from the lower half of the body back to
the heart.
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The longest vein in the human body would be the saphenous
vein.