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Any vein, Artery or cappillary can be classed as a blood vessel as they all carry blood around the body. To be considered an artery the blood vessel must carry blood away from the heart. To be considered a Vein the blood vessel must carry blood towards the heart. A cappillery is an incredibly small blood vessel, it has walls thin enough to allow gasses to pass through, from the blood, to the body and vice versa. NB:- Most veins carry de-oxygenated and most arteries carry oxygenated blood. However, this is not allways the case. For example, the pulmonary vein carries oxygenated blood from the lungs to the Heart. Also, the Pulmonary artery carries de-oxygenated blood from the heart to the lungs. hope this helps

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