Most blood vessels that carry oxygen-poor blood are veins. Specifically, veins return deoxygenated blood from the body back to the heart, while arteries carry oxygen-rich blood away from the heart to the body's tissues. The exception to this is pulmonary arteries, which carry oxygen-poor blood from the heart to the lungs, and pulmonary veins, which carry oxygen-rich blood from the lungs back to the heart.
Most blood vessels that carry oxygen poor blood are
Arteries
Veins
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