| A | B |
|---|
| active immunity | disease resistance as a result of memory cells recognizing antigensto which they have been previously exposed |
| antiserum | solution containing blood serum and antibodies extracted from an animal and injected into another animal in order to fight disease |
| autoimmune disease | disease caused by the abnormal response of the immune system against the individual's own body |
| B cell | lymphocyte that matures in the bone marrow; can form plasma cells and memory cells |
| cytotoxic T cell | specialized lymphocyte that can kill infected body cells directly by releasing proteins and indirectly attracting macrophages |
| endotoxin | poisonous chemical released by dead bacteria when their cell walls rupture |
| exotoxin | poisonous chemical produced by living bacteria that causes disease |
| helper T cell | specialized lymphocyte that binds with B cells and can release chemicals to stimulate B cells to form plasma cells |
| interferon | protien made by a virus infected host cell that prevents viral reproduction in healthy cells |
| lymphocyte | white blood cell involved in the immune response; may be either a B cell or a T cell |
| macrophage | white blood cell that engulfs and digests pathogens |
| memory cell | produced during the 1st exposure to an antigen; if a pathogen reappears, these recognize its antigens and allow quick immune response |
| monoclonal antibody | specific antibody produced in the lab from the fusion of cancer cells and lymphocytes |
| passive immunity | temporary immunity acquired by transfer of antibodies to the recipient |
| pathogen | disease causing microorganism |
| plasma cell | antibody-producing cell resulting from division of a B cell |
| receptor | a protein embedded in the membrane of T cells that can recognize self proteins on B cells |
| suppressor T cell | specialized lymphocyte that can release chemicals that reduce the response of macrophages and B cells |
| T cell | lymphocyte that matures in the thymus gland; can defend against body cells in which viruses are reproducing |
| thymus gland | organ in which lymphocytes mature into T cells |
| vaccine | preparation created from weakened or killed microorganisms, viruses, or toxins that causes an immune response and prevents specific diseases |
