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| 6762743891 | Pathogen | A bacterium, fungus, virus or other disease-causing agents | 0 | |
| 6762743892 | Immune System | Enables an animal to avoid or limit many infections | 1 | |
| 6762743893 | Innate Immunity | Includes Barrier defenses. Rapid response. | 2 | |
| 6762743894 | Adaptive Immunity | Aquired immune response. Molecular Recognition relies on a vast arsenal of receptors, each of which recognizes a feature typically found only on a particular part of a particular molecule in a particular pathogen | 3 | |
| 6762743895 | Lysozyme | an enzyme that breaks bacterial cell walls | 4 | |
| 6762743896 | Phagocytosis | Indigestion and break down bacteria and other foreign substances | 5 | |
| 6762743897 | Neutrophils | A type of phagocytic cell. Circulate in the blood, attracted by signals from infected tissues and then engulf and destroy the infecting pathogens | 6 | |
| 6762743898 | Macrophages | A larger type of phagocytic cells. "big eaters". Some migrate throughout the body and some reside permanently in organs and tissues. | 7 | |
| 6762743899 | Dendritic Cells | Another type of phagocytic cell. populate tissues that contact the environment (skin) | 8 | |
| 6762743900 | osinophils | Another type of phagocytic cell. Found beneath mucosal surfaces. Discharge destructive enzymes | 9 | |
| 6762743901 | Natural Killer Cells | Involved in cellular innate defenses. Circulate through the body and detect viruses. Release chemicals that leads to cell death | 10 | |
| 6762743902 | Interferons | Proteins that provide innate defense by interfering with viral infections | 11 | |
| 6762743903 | Complement System | consists of roughly 30 proteins in blood plasma | 12 | |
| 6762743904 | Inflammatory Response | The changes brought about by signaling molecules released upon injury or infection, | 13 | |
| 6762743905 | Mast Cells | Inflammatory signaling molecule that released histamine. | 14 | |
| 6762743906 | Histamine | Stored in mast cells. Triggers nearby blood vessels to dilate and become permeable | 15 | |
| 6762743907 | Lymphocytes | White blood cells. Originate from stem cells in the bone marrow. | 16 | |
| 6762743908 | T Cells | Originate in bone marrow and mature in thymus (organ in the thoracic cavity above the heart) | 17 | |
| 6762743909 | B Cells | Remain and mature in the bone marrow. Y shaped molecule with 2 heavy chains and 2 light chains | 18 | |
| 6762743910 | Antigen | Any substance that elicits a B or T cells response | 19 | |
| 6762743911 | Antigen Receptor | In adaptive immunity, recognition occurs when a B cell or T cell binds to an antigen, such as a bacterial or viral protein, via a protein called a ? | 20 | |
| 6762743912 | Epitope | The small, accessible portion of an antigen that binds to an antigen receptor | 21 | |
| 6762743913 | Antibody | Secreted protein, also known as immunoglobulin. | 22 | |
| 6762743914 | MHC - Major Histocompatibility Complex molecule | The host protein that displays the antigen fragment on the cell surface | 23 | |
| 6762743915 | Antigen Presentation | Display of the antigen fragment in an exposed groove of the MHC protein | 24 | |
| 6762743916 | Effector Cells | Short-lived cells that take effect immediately against the antigen and any pathogens producing that antigen. | 25 | |
| 6762743917 | Plasma Cells | The effector forms of B cells. Secrete antibodies | 26 | |
| 6762743918 | Memory Cells | long-lived cells that can give rise to effector cells if the same antigen is encountered later in the animal's life. | 27 | |
| 6762743919 | Humoral Immune Response | Occurs in the blood and lymph, which were once called body humors (fluids). In this response, antibodies help neutralize or eliminate toxins and pathogens in the blood and lymph | 28 | |
| 6762743920 | Cell-Mediated Immune Response | Specialized T cells destroy infected host cells. | 29 | |
| 6762743921 | Helper T Cell | Triggers both the humoral and cell-mediated immune responses. Signals from this cell initiate production of antibodies that neutralize pathogens and activate T cells that will kill the infected cells. | 30 | |
| 6762743922 | Cytotoxic T Cells | Use toxic proteins to kill cells infected by viruses or other intracellular pathogens before pathogens fully mature. | 31 | |
| 6762743923 | Active Immunity | The defenses that arise when a pathogen infects the body and prompts a primary or secondary immune response | 32 | |
| 6762743924 | Passive Immunity | A different type of immunity results when the IgG antibodies in the blood of a pregnant female cross the placenta to her fetus | 33 | |
| 6762743925 | Autoimmune Disease | The immune system is active against particular molecules of the body. The immune system attacking itself | 34 | |
| 6762743926 | Immunodeficiency Disease | A disorder in which an immune system response to antigens is defective or absent | 35 | |
| 6762743927 | Toll-like receptor | Binds to fragments of molecules normally absent from vertebrate body but is a characteristic of pathogens | 36 | |
| 6762743928 | Clonal selection | The proliferation of a b cell or T cell into a clone of cells occurs in response to a specific antigen and to immune cell signals Encounter with an antigen selects which lymphocyte will divide to produce a clonal population of cells for a specific epitope | 37 | |
| 6762743929 | Primary immune response | The production of effector cells from a clone of lymphocytes during the first exposure to an antigen B and T cells give rise 2 their effector forms | 38 | |
| 6762743930 | Secondary immune response | Faster response Adaptive immunity | 39 | |
| 6762743931 | Antigen-presenting cell | Dendritic cell, macrophage, or B cell | 40 | |
| 6762743932 | Immunization | Antigens into body Induces active and passive immunity artificially | 41 | |
| 6762743933 | Monoclonal antibodies | Clone of B cells Identical and specific for the same epitope | 42 |
