so called because it ramifies like an artery (portal vein) or because, while proceeding from the heart like an artery, it contains unoxygenated blood, like a vein (pulmonary artery). Syn: vena arteriosa.
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so called because it ramifies like an artery (portal vein) or because, while proceeding from the heart like an artery, it contains unoxygenated blood, like a vein (pulmonary artery). Syn: vena arteriosa.