Complete the following: 1. Bacteria get in the interstitial fluid. Bacteria damage local cells and macrophages. These cells release that attract to the area. These cells phagocytize vessels then enter lymphatic organs called . Bacteria encounter Chapters 21-22 Lymphatic and Immune Systems Updated, Hybrid Labs 10/22 16 macrophages in these organs. Macrophages bacteria. Macrophages present antigens to B lymphocytes, which differentiate in to cells that proliferate and secrete proteins called which 2. Virus infected cells get into the blood. Viruses damage tissue and damaged cells release that attract local phagocytic cells that reside in the tissue called . These cells release additional .. Inflammation and fever begin. Virus infected cells enter the blood. Virus infected cells in the blood encounter macrophages in the lymphatic organ called the . Macrophages infected cells. Macrophages present antigens to T cells. This group of T cells proliferates and secretes cytokines, which activate 3. Mark the following True or False. If the statement is False, correct it to make it a true statement. a. The thoracic duct drains lymph from the right upper limb and the right side of the head, neck and thorax. b. The spleen filters lymph, whereas the lymph nodes filter blood. c. Lymph capillaries surround blood capillaries. pick up excess interstitial fluid and return it to the blood. d. Tonsils are specialized MALT that are partially encapsulated. 4. Describe the similarities and differences between B and T cells..