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Precaval veins are major veins in vertebrates that carry deoxygenated blood from the anterior parts of the body, including the head, neck, and forelimbs, back to the heart. These veins drain blood into the right atrium through the precaval system, which is situated anterior to the heart. The term "precaval" specifically refers to the veins located in front of (pre-) the heart's ________ ____ _____ _________ ______ _________ __________ ____ __________ ________ ________ ______.
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