S 1 : There is no transportation system in any city that can compare in efficiency with the circulatory system of the body. P: The larger one goes from the heart to the various other parts of the body. Q: If you imagine two systems of pipes, one large and one small, both meeting at a central pumping station, you'll have an idea of the circulatory system. R: These pipes are called arteries, veins and capillaries. S: The smaller system of pipes goes from the heart to the lungs and back. S 6 : Arteries are blood vessels in which blood is going away from the heart. The Proper sequence should be: