BIOB32H3 Lecture Notes - Immunoglobulin A, Immunoglobulin D, Integumentary System

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The lymphatic system consists of: lymph, lymphatic vessels, lymphoid tissues and organs, lymphocytes and supporting phagocytic cells. Functions of lymphatic system: primary function is production, maintenance, and distribution of lymphocytes, lymphocytes must, detect where problems exist, be able to reach the site of injury or infection. Lymphatic vessels include: lymphatic capillaries, small lymphatic vessels, major lymph-collecting vessels. Major lymph-collecting vessels: superficial and deep lymphatics, thoracic duct, cisterna chyli, right lymphatic duct. Lymphocytes: three classes of lymphocytes, t (thymus dependent) cells, b (bone marrow-derived) cells, nk (natural killer) cells. Lymphocyte production (lymphopoiesis: involves bone marrow, thymus, and peripheral lymphoid tissue, b cells and nk cells mature in bone marrow, t cells mature in the thymus. Lymphoid tissue: connective tissue dominated by lymphocytes, lymphoid nodules, lymphocytes densely packed in areolar tissue, found in the respiratory, digestive, and urinary tracts, malt (mucosa-associated lymphoid tissue, collection of lymphoid tissues linked with the digestive system.

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