"Arteries Carry Oxygenated Blood, Veins Carry Deoxygenated Blood"
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Stating flatly that arteries always carry oxygenated blood overstates a pattern true only in systemic circulation — the pulmonary artery, per Bio 3203, carries deoxygenated blood toward the lungs.
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The pulmonary artery carries low-oxygen blood from heart to lungs, reversing the usual pattern.
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This entry states the popular framing — Bio 3211 gives the defining property it overlooks.