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1.
S₁: There is no transportation system in any city that can compare in efficiency with the circulatory system of the body.
S₆: Arteries are blood vessels in which blood is going away from the heart.

P: The larger one goes from the heart to the various other parts of the body.
Q: If you will 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 hbart to the lungs and back.