Arteries: Carry blood away from the heart, Thick muscular walls, Lumen of the vessel is small, Contains blood under high pressure, Aorta, Usually carry oxygenated blood (except for the pulmonary artery), , Capillaries: Where gas exchange occurs, One cell thick, Contains blood under very low pressure, Found predominantly in the muscles and lungs, , Veins: Carry blood to the heart, Thin walls, Lumen of the vessel is large, Carry blood under low pressure, Contain valves to prevent blood flowing backwards, Usually carry deoxygenated blood (except for the pulmonary veins), , Superior vena cava,

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