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Blood veins are the blood vessels that carry deoxygenated blood from the body's tissues back to the heart. Unlike arteries, veins have thinner walls and larger diameters, which makes them less efficient at pushing blood against gravity. Most veins contain valves that prevent blood from flowing backward, ensuring it moves toward the heart. Veins also have a lower pressure than arteries, allowing them to hold more blood even when the body is not actively pumping it.
blood veins