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One of the main functions of the lymphatic system is returning lymph to circulation. As blood circulates through the body, nutrients, wastes, and gases are exchanged between the blood and interstitial fluid. Pressure forces fluid out of the blood at the arterial ends of the capillary beds and most of it to be reabsorbed at the venous ends. The fluid that remains behind becomes part of the interstitial fluid. This leaked fluid and any plasma proteins that escapes from the blood stream, must be carried back to the blood to ensure that the cardiovascular system has sufficient blood volume to operate properly. The lymphatic vessels collect the excess interstitial fluid and return it to the blood through the thoracic duct.

Cowan, M. Kelly. Microbiology: A Systems Approach. Boston: McGraw-Hill, 2012. Print.

Marieb, Elaine M., and Katja Hoehn. Anatomy and Physiology. San Francisco: Pearson Education, 2011. Print.

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