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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.
Best Answer: Arteries move blood away from the heart.. they are muscular tubes that can withstand large pressure.. Capillaries join the blood flow from the arterials (small arteries) to the venules (small veins)... This is where the exchange of nutrients and gases occur at the cellular level because the capillaries are only one cell thick. Veins move the blood back toward the heart.. they are larger in diameter and may contain valves to assist in moving the blood back to the heart..