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| 5064918971 | Innate immunity | Present before any exposure to pathogens and is effective from the time of birth (nonspecific responses, external barriers, and cellular/chemical defenses) | 0 | |
| 5064930580 | Acquired immunity | Develops after expose to agents such as microbes, toxins, or other foreign substances | 1 | |
| 5064938461 | Humoral resoponse | Pathogens in lymph (B lymphocytes or B cells are used) | 2 | |
| 5064960352 | Cell mediated | Pathogens in cells (uses Cytotoxic lymphocytes) | 3 | |
| 5064966826 | Barriers | Structures that prevent the intrusion of foreign substances and pathogens ( Mucus membranes and the acidity of skin) | 4 | |
| 5064976061 | Patrolling cells | White blood cells | 5 | |
| 5064978097 | Nitric axide | Degrades microbes in lysosomes | 6 | |
| 5064984496 | Neutrophils | Engulf and destroy microbes in infected tissues | 7 | |
| 5064987030 | Macrophages | Are part of the lymphatic system and are found throughout the body | 8 | |
| 5064990709 | Eosinophils | Discharge destructive enzymes (don't ingest) | 9 | |
| 5064995705 | Dendritic cells | Engulf microbes and carries a portion of the pathogen back to the spleen and lymph nodes to stimulate the development of acquired immunity | 10 | |
| 5065009857 | Complement proteins | Search for microbes, kill microbes, coats intruders, attracts macrophages, and causes inflamation | 11 | |
| 5065017057 | Interferon | Proteins provide innate defense against viruses and help activate macrophages | 12 | |
| 5065023508 | Mast cells | Release histamine when you get injured | 13 | |
| 5065026062 | Histamine | Promotes changes in blood vessels to supply more blood | 14 | |
| 5065029920 | Fever | Inhibits bacterial growth, stimulates phagocytosis, speeds up repair of tissues, and causes the liver and spleen to store iron | 15 | |
| 5065040075 | Natural killers | Attacks damaged cells by releasing chemicals that lead to the death of the cell by apoptosis | 16 | |
| 5065046361 | Antigens | Foreign molecules or bad cells | 17 | |
| 5065058623 | Cytokines | Secreted by macrophages and dendritic cells to recruit and activate lymphocytes | 18 | |
| 5065069089 | Membrane receptors | B and T cells use these to find antigens | 19 | |
| 5065071991 | Epitopes | Bumps on antigens that B and T cells recognize | 20 | |
| 5065081747 | Antigen receptors | B and T cells have roughly 100,000 of these | 21 | |
| 5065085636 | Plasma cells | Creates antibodies which are antigen receptors | 22 | |
| 5065093545 | Cell mediated immune response | Involves activation and clonal selection of cytotoxic T cells | 23 | |
| 5065098259 | Humoral mediated immune response | Involves activation and clonal selection of B-cells resulting in the production of secreted antibodies | 24 | |
| 5065108324 | MHC 1's | Found on almost all nucleated cells, they display peptide antigens to cytotoxic T cells | 25 | |
| 5065124044 | MHC 2's | Mainly on dendritic cells, macrophages, and B-cells which are antigen presenting cells that display antigens to cytotoxic T-cells and helper T-cells | 26 | |
| 5065051031 | T-cells | Attack, learn, and remembers pathogens that hide in infected cells, matures in the thymus (helper T-cells, Cytotoxic T-cells, and Memory T-cells) | 27 | |
| 5065054451 | B-cells | Attack, learn, and remember pathogens that are circulationg in the blood and lymph, matures in bone marrow | 28 | |
| 5065146637 | CD4 | A surface protein in helper T-cells that binds to MHC 2's | 29 | |
| 5065171660 | CD8 | A surface protein that greatly enhances the interactions between a target cell and a cytotoxic T-cell | 30 | |
| 5065191547 | Neutralization | Occurs when a pathogen can no longer infect a host because it is bound to an antibody | 31 | |
| 5065200054 | Opsonization | Occurs when antibodies bound to antigens increase phagocytosis | 32 | |
| 5065206097 | Membrane attack complex | Antibodies together with proteins of the complement system generate this and cell lysis | 33 | |
| 5065222063 | Clonal selection | The binding of a mature B or T lymphocyte to an anitgen induces the lymphocyte to divide rapidly | 34 | |
| 5065235462 | Primary immune response | The first exposure to a specific antigen during which B-cells called plasma cells are generated, and T-cells are activated | 35 | |
| 5065237400 | Secondary immune response | Memory cells facilitate a faster, more efficient response | 36 | |
| 5065278801 | Active immunity | Develops naturally in response to an infection due to B and T lymphocytes and the resulting memory cells (this can develop following a immunization) | 37 | |
| 5065298730 | Passive immunity | Provides immediate, short-term protection (weeks or months) and it is conferred naturally when IgG crosses the placenta from mother to fetus or when IgA passes from mother to infant in breast milk | 38 | |
| 5065334984 | Organ/blood rejection | Happens when MHC tissue does not match | 39 | |
| 5065350043 | Rh+ antibodies | An antibody that can cross the placenta and can attack fetuses if the fetus is Rh- | 40 | |
| 5065360157 | Allergens | Antigens that cause exaggerated responses (allergies) | 41 | |
| 5065369579 | Antihistamines | Decrease allergy symptoms by blocking histamine receptors | 42 | |
| 5065388935 | Autoimmune diseases | The immune system loses tolerance for self and turns against certain molecules of the body | 43 | |
| 5065408179 | Immunodeficiency | Results from hereditary or developmental defects that prevent proper functioning of innate, humoral, and/or cell-mediated defenses | 44 | |
| 5065417342 | Acquired immunodeficiency syndrome (AIDS) | Is caused by a virus | 45 |
