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Lymphatic System Organization • Lymphoid Nodules • Tonsils are lymphoid nodules in the pharynx wall Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Lymphatic System Organization • What are the Lymphoid Organs? • Important lymphoid organs include: • Lymph nodes • Thymus • Spleen Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Lymphatic System Organization • What are Lymph Nodes? • Encapsulated masses of lymphoid tissue containing lymphocytes • Monitor and filter lymph • Remove antigens • Starts immune response Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Lymphatic System Organization • What is the Thymus? • Lies behind sternum • Produces thymosins • Hormones that regulate T cell development Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings Lymphatic System Organization • What is the Spleen? • White pulp • Removes antigens • Starts immune response • Red pulp • Contains red blood cells • Recycles damaged or out-dated RBCs Copyright © 2007 Pearson Education, Inc., publishing as Benjamin Cummings
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