Arteries, Carry blood away from the heart, Thick muscular wall, High blood pressure, No valves (except semilunar valves at heart), Carry oxygenated blood (except pulmonary artery), Veins, Carry blood toward the heart, Thinner wall with less muscle, Low blood pressure, Have valves to prevent backflow, Carry deoxygenated blood (except pulmonary veins).

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