| A | B |
|---|
| pathogen | a disease-causing microorganism |
| mucous membrane | a moist epithelial layer that lines the body's moist surfaces |
| antibodies | Y-shaped proteins that bind to antigens |
| the inflammatory response | a protective response of tissues affected by disease or injury, characterized by redness, swelling, and pain |
| interferon | a protein produced by cells infected by a virus; this protein can protect uninfected cells against the reproduction of the virus |
| infection | invasion of body tissue by a disease-causing organism |
| nonspecific defense | a defense that works against many different pathogens |
| specific defense | a defense that works against a single species of pathogen |
| fever | an elevated body temperature (above 37˚C or 98.6˚F) |
| macrophage | a very large white blood cell that engulfs pathogens |
| antigen | a bit of foreign material that can stimulate the production of a matching antibody |
| mucus | a thick, slippery secretion produced by a mucous membrane |
| B cell | a white blood cell that matures in the bone marrow |
| T cell | a white blood cell that matures in the thymus |
| thymus | an immune system gland located in the upper chest |
| helper T cell | a T cell that helps direct immune system reactions. This type of cell is targeted by the HIV virus. |
| memory cell | long-living immune cells that remember how to build an antibody that binds to a specific pathogen |
| vaccine | a dead or weakened pathogen that is injected in order to stimulate the immune system to produce antibodies |
| auto-immune disease | when the body manufactures antibodies against itself (anti-self) |
| HIV | the human immunodeficiency virus. This virus attacks immune cells (particularly helper T cells), and causes AIDS. |
| AIDS | Acquired Immune Deficiency Syndrome, a disease caused by HIV attacking immune cells, particularly helper T cells |
| allergy | an inappropriate immune response to a non-pathogen, such as pollen or food |
| histamine | an inflammation-producing chemical secreted by body cells |
