The Arteries take the oxygenated blood away from the heart. The blood going through here is under high pressure so the walls of the arteries are very thick. They also have a narrow bore (hole). Arteries appear red when viewed through the skin.
Veins on the other hand, take deoxygenated blood to the heart. The blood is under low pressure so veins have thinner walls, and a large bore (hole). Valves keep the blood moving in the right direction. Veins appear blue when viewed under the skin, because of the refraction of light through the skin.
Capillaries are in between arteries and veins. They are very small, as some of them go to each individual cell. Caterpillars have one celled thick walls and they carry both oxygenated and deoxygenated blood. Because Capillaries are so thin oxygen, nutrients and hormones can flow in and out.
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BLOOD!
=)
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