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There are two types of blood vessels in the circulatory system of the body: arteries that carry oxygenated blood from the heart to various parts of the body and veins that carry blood towards the heart for purification.hey are tiny branches of arteries that lead to capillaries and help maintain the pressure and blood flow in the body. Venous valves prevent blood from flowing in the opposite direction. Connective tissues make up the outermost layer of a vein which is also known as-tunica adventitia or tunica externa.
# 71 Arteries, veins and capillaries-structure and functions. There are 3 main kinds of blood vessels â arteries, veins and capillaries. 1  Arteries carry blood away from the heart. 2  They divide again and again, and eventually form very tiny vessels called capillaries.