Blood by the lymphatic system rather than by the

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blood by the lymphatic system rather than by the venous draninage of the small interstine 3.What are the thymus gland functions? Immature lymphocytes leave the bone marrow and travel by the blood to the thymus gland, where they take up residence and receives immunocompetences to become T cells 4. Identify each of the following in a lymph node : afferent lymphatic vessels and efferent vessels. a. afferent lymphatic vessels b. efferent lymphatic vessels c. What is the function of the macrophages within the lymph nodes? The thymic marcophages help clear out the debris of the dead and dying cells
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d. Identify spleen functions. It acts as a filter for blood as part of the immune system. Old red blood cells are recycled in the spleen, and platelets and white blood cells are stored there. The spleen also helps fight certain kinds of bacteria that cause pneumonia and meningitis. 5. T Lymphocytes: Some activated cytotoxic T cells produce perforin. What is the function of perforin? Perforin inserts into the plasma membrane of the target cells and creates channels in the membrane 6. Some activated cytotoxic T cells produce Lymphotoxin . What is the function of lymphotoxin? Cytotoxic T cells may also destroy target cells by releasing a toxic molecule called lymphotoxin, which activates enzymes 7. Activated B Lymphocytes are transformed into plasma cells that produce antibodies. Name five ways antibodies can destroy foreign cells and substances. 1. Neutralizes antigens 2. Immobilizing bacteria 3. Agglutinating and precipitating antigens 4. Activating complement 5. Enhancing phagocytes
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