Arteries
Arteries are vessels that carry blood away from the heart. Arteries have a thick wall and thick layers of muscle because the blood that is travelling in arteries, the blood pressure in them is high and arteries also have elastic fibres. They also have a small-bore (hole) and they do not have any valves. The apparent colour of blood within the Arteries is red.
Veins
Unlike Arteries, Veins take the blood back to the heart. Veins have thinner walls, less muscular and elastic tissue because the blood in veins is under low pressure. Veins also have a large bore(hole) and veins have a valves that keep the blood moving in the right direction. Veins appear to be blue when they are close to the skin.
Capillaries
Capillaries are between arteries and veins. They are a very small one, one cell blood vessels. Because Capillaries are so thin, oxygen, nutrients, and hormones can flow out of the blood into the tissues and also waste materials can flow in.
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