Veins always carry oxygen-poor blood.

Name: Veins always carry oxygen-poor blood.
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Veins carry both oxygen-poor blood and oxygen-rich blood. However, the majority of the blood in veins is oxygen-poor because it has already circulated through the body and delivered its oxygen to the tissues. The exception to this is the pulmonary vein, which carries oxygen-rich blood from the lungs to the heart.

Veins Always Carry Oxygen-Poor Blood