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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



circulatory system  listen  (SER-kyoo-lah-tor-ee SIS-tem)

  The system that contains the heart and the blood vessels and moves blood throughout the body. This system helps tissues get enough oxygen and nutrients, and it helps them get rid of waste products. The lymph system, which connects with the blood system, is often considered part of the circulatory system.