Blood vessels

Blood vessels are responsible for transporting blood around the body. Blood is carried away from the heart by arteries, and back to the heart via veins. Along with these, you get smaller blood vessels known as Arterioles (an extension of an artery which leads to a capillary), capillaries (the smallest type of blood vessel which allows for the passing of nutrients, dissolved gases etc.) and Venules (an extension of a vein which connects to a capillary).