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Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body.
Veins are often categorized based on their location and any unique features or functions. Your body circulates blood on two different tracks called the systemic circuit and the pulmonary circuit. Veins are based on the circuit they’re found in: