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The primary function of the circulatory system is transportation. The need for an efficient transportation system in the body is critical. Transportation needs include continuous movement of oxygen and carbon dioxide, nutrients, hormones and other important substances. Wastes produced by the cells are released into the bloodstream on an ongoing basis and are transported by the blood to the excretory organs. The circulatory system also helps regulate body temperature by distributing heat throughout the body and by assisting in retaining or releasing heat from the body by regulating blood flow near the body surface. Certain cells of the circulatory system can also become involved in the defense of the body or immunity.

The Lymphatic systems function includes the movement of fluids and certain large molecules from the tissue spaces around the cells and movement of fat-related nutrients from the digestive tract back to the blood. The lymphatic system is also involved in the functioning of the immune system, which plays a critical role in the defense mechanism of the body against disease.

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