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Simply put, the circulatory system handles blood flow in the human body. Blood flow is necessary for the body's cells to get food and oxygen so they can function, and they also need to dump waste and carbon dioxide. The blood is the fluid that transports all these materials in both directions, and circulation of the blood is necessary to life. The heart acts as a pump for the system, and its regular contractions force blood through the vessels in the circulatory system. There are volumes of information on blood and on the circulatory system, and a link to the Wikipedia articles will get you started on your way to an understanding of this extraordinary biological system.

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17y ago

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