Arteries
Arteries carry oxygenated blood away from the heart. The blood in arteries is under high pressure that's why they have thick walls and thick layers of muscles and elastic fibre. Arteries appear red through the skin when its viewed. They also have a small-bore(hole) and they do not have any valves.
Veins
Veins carry de-oxygenated blood back to the heart. The blood in veins is under low pressure so they have thinner walls. They have less muscular and elastic tissue. Veins appear blue when they are seen because of light refracting through the skin. They also have valves and a large-bore(hole).
Capillaries
Capillaries contain both oxygenated and de-oxygenated blood. They have one-cell thick walls and they don't have any bore. Capillaries allow oxygen, nutrients, hormones to flow out of the blood and let other waste to flow in.
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