| A | B |
|---|
| innate | Type of immunity which is common to all animals at birth |
| acquired | Defense system that is activated upon exposure to infecting pathogens |
| lysozyme | An enzyme that digests microbial cell walls |
| phagocytosis | Process in which a cell ingests and digests foreign organisms or particles |
| skin | Primary First-level barrier in humans |
| neutrophils | Most abundant phagocytic cells in humans |
| macrophages | Large "big eater" phagocytic cells which engulf invading pathogens |
| interferon | Proteins that provide innate defense against viruses |
| complement system | Group of about 30 proteins that provide innate defense by fighting infections |
| inflammatory response | Cluster of symptoms such as swelling, redness, and fever in response to infection or injury |
| histamine | Chemical stored in mast cells that signals start of inflammatory response |
| fever | Symptom of inflammatory response brought on by release of pyrogens |
| natural killer cells | Cells which patrol the body looking for infected cells that no long express class I MHC molecules |
| B cells | Activated by T-h cells, then form plasma or memory cells |
| Cytotoxic T cells | Activated by interleukin 2 to attch to infected cell and destroy it |
| Helper T cells | Clone themselves after interacting with antigens presented on APC |
| Helper T cells | Activate cytotixic T cells to lyse infected cells |
| plasma cells | Made from B cells which differentiate and secrete antibodies |
| killer T cells | Another name for cytotoxic T cells |
| humoral immune response | Immune response which results in antibodies being circulated in the blood and lymph |
| cell-mediated immune response | Immune response which involves activation and cloning of cytotoxid T cells |
| antigen | Chemical marker on surface of cell which makes identification of that cell type possible |
| antibodies | Proteins which attach to antigens and mark them for destruction by macrophages |
| memory B cells | Cells which remain in the body after the pathogen is gone to respond to re-infection |
