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| 9603864295 | First Line of Defense | Nonspecific barrier to keep out pathogens ex: skin, stomach acid, mucous, cilia |  | 0 |
| 9603864296 | Second Line of Defense | Nonspecific defense and inflammatory response initiated by chemical signals to attack and isolate invading pathogens | 1 | |
| 9603864297 | Inflammatory Response | Vasodilation, phagocytosis, and increase in body temperature |  | 2 |
| 9603864298 | Histamines | chemical signals that trigger vasodilation, increasing blood supply to area | 3 | |
| 9603864300 | Immune response (third line of defense) | B and T cells; humoral and cell-mediated response | 4 | |
| 9603864301 | Lymphocyte | White blood cell |  | 5 |
| 9603864302 | B Cells | involved in Humoral response - produces plasma cells/antibodies | 6 | |
| 9603864304 | Helper T Cell | activates cytotoxic T and B memory cells |  | 7 |
| 9603864305 | Cytotoxic (killer) T Cell | Kills body cells that have been infected with pathogens; stimulated by antigens and helper T-cells |  | 8 |
| 9603864306 | Macrophages | WBC that engulfs large numbers of pathogens; presents antigen to activate helper T cells |  | 9 |
| 9603864307 | Memory Cells | Responsible for lifelong immunity by storing copy B and T cells to more quickly fight secondary infection |  | 10 |
| 9603864308 | Antibody | Y-shaped protein produced by B cells/plasma cells to tag pathogen for destruction |  | 11 |
| 9603864309 | Antigen | Identifying marker on the outside of a pathogen |  | 12 |
| 9603864311 | HIV | A virus that attacks helper T cells |  | 13 |
| 9603864313 | Allergy | immune response to harmless substances resulting in mast cells releasing histamines | 14 | |
| 9603864314 | bacteriophages | viruses that infect bacteria | 15 | |
| 9603864315 | lytic cycle | virus cycle that causes production of new viruses as soon as DNA/RNA is inserted into host cell resulting in the destruction of the host cell | 16 | |
| 9603864316 | lysogenic cycle | cycle whereby viral DNA is incorporated into host chromosome for a while before it is triggered to reproduce | 17 | |
| 9603864318 | vaccines | weak or dead pathogen injected to stimulate the immune system and produce antibodies | 18 | |
| 9603864322 | mast cells | cells that release histamine in the inflammatory response | 19 |
