miércoles, 19 de octubre de 2011

THE CIRCULATORY SYSTEM

THE CIRCULATORY SYSTEM

Circulation is the movement of blood through the circulatory system. Circulation carries nutrients and oxygen to all parts of the body, and collects waste substances, which can be dangerous.

Our heart works like a pump, and moves blood through the body. It never stops beating.

Blood vessels are tubes which transport blood through the circulatory system. There are three kinds: arteries, veins and capillaries.

- Arteries are the blood vessels which carry blood away from the heart.

- Veins are the blood vessels which carry blood into the heart.

- Capillaries are tiny blood vessels which connect arteries to veins. They reach every part of your body.

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