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The term Great veins refers to one of the following veins:
- Superior vena cava, a large diameter, yet short, vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium.
- Inferior vena cava, the large vein that carries de-oxygenated blood from the lower half of the body into the right atrium of the heart.
- One of the four pulmonary veins (two from each lung).
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