A vessel in which blood circulates.
Tube that conducts blood either away from or toward the heart in multicellular animals. Freshly oxygenated blood is carried in the arteries—major vessels which give way to the arterioles (small arteries) and finally capillaries; deoxygenated blood is returned to the heart by way of capillaries, then venules (small veins) and veins. blood-vessel, bloodvessel