And one easy way to remember this is by remembering that a wave starts with A and so does our artery. Now the arteries most of the time carry oxygenated blood but there are times as we'll see in just a moment in which an artery can actually carry deoxygenated blood. Now the arteries, these blood vessels come in many different sizes. The largest artery in the body is known as our aorter and then we have the arteries followed by smaller arteries known as arterios and finally our capillaries. Now the second type of blood vessel is the vein and if the artery carries blood away from the heart and to the tissues then our veins bring our blood to the heart and away from our tissues and organs. Now most of the veins in the body actually carry deoxygenated blood but there are examples as we'll see in a moment in which veins actually carry oxygenated blood.