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| 61. | lymph | fluid contained within the lymphatic system |
| 62. | lymphocytes | white blood cells characterized by a large nucleus and small rim of cytoplasm |
| 63. | lymphoid nodules | unencapsulated patches of lymphoid tissue found throughout the body |
| 64. | MHC class II | found on macrophages, dendritic cells, and B cells, it binds to CD4 molecules on T cells |
| 65. | MHC class I | found on most cells of the body, it binds to the CD8 molecule on T cells |
| 66. | MHC polygeny | multiple MHC genes and their proteins found in body cells |
| 67. | MHC polymorphism | multiple alleles for each individual MHC locus |
| 68. | macrophage oxidative metabolism | metabolism turned on in macrophages by T cell signals that help destroy intracellular bacteria |
| 69. | macrophage | ameboid phagocyte found in several tissues throughout the body |
| 70. | major histocompatibility complex | (MHC) gene cluster whose proteins present antigens to T cells |
| 71. | mast cell | cell found in the skin and the lining of body cells that contains cytoplasmic granules with vasoactive mediators such as histamine |
| 72. | memory T cells | long-lived immune cell reserved for future exposure to an pathogen |
| 73. | monocyte | precursor to macrophages and dendritic cells seen in the blood |
| 74. | mucosa-associated lymphoid tissue | (MALT) lymphoid nodule associated with the mucosa |
| 75. | natural killer cell | (NK) cytotoxic lymphocyte of innate immune response |
| 76. | naive lymphocyte | mature B or T cell that has not yet encountered antigen for the first time |
| 77. | negative selection | selection against thymocytes in the thymus that react with self-antigen |
| 78. | neutralization | inactivation of a virus by the binding of specific antibody |
| 79. | neutrophil | phagocytic white blood cell recruited from the bloodstream to the site of infection via the bloodstream |
| 80. | opsonization | enhancement of phagocytosis by the binding of antibody or antimicrobial protein |
| 81. | passive immunity | transfer of immunity to a pathogen to an individual that lacks immunity to this pathogen usually by the injection of antibodies |
| 82. | pattern recognition receptor | (PRR) leukocyte receptor that binds to specific cell wall components of different bacterial species |
| 83. | perforin | molecule in NK cell and cytotoxic T cell granules that form pores in the membrane of a target cell |
| 84. | peripheral tolerance | mature B cell made tolerant by lack of T cell help |
| 85. | phagocytosis | movement of material from the outside to the inside of the cells via vesicles made from invaginations of the plasma membrane |
| 86. | plasma cell | differentiated B cell that is actively secreting antibody |
| 87. | polyclonal response | response by multiple clones to a complex antigen with many determinants |
| 88. | positive selection | selection of thymocytes within the thymus that interact with self, but not non-self, MHC molecules |
| 89. | primary adaptive response | immune system's response to the first exposure to a pathogen |
| 90. | primary lymphoid organ | site where lymphocytes mature and proliferate; red bone marrow and thymus gland |
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