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An artery is a vessel that carries blood out of the heart, into the tissues. A vein is a vessel that carries blood from the tissues back to the heart. The fact that arteries carry oxygenated blood exclusively and veins, solely deoxygenated blood is not true. Our blood is oxygenated in the tissues of our lungs, so the vessels that bring this fresh, oxygenated blood from these tissues back to our heart are called... pulmonary veins! It's just a matter of vocabulary.

AnswerBlood coming from the pulmonary veins is oxygenated because it is coming from the lungs, the site of gas exchange.
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