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Key terms
| Term | Definition |
|---|---|
| lymph | The fluid found between body cells; absorbed in the lym- phatic system and returned to the bloodstream. |
| lymph node | A small mass of tissue through which lymph passes and in which lymphocytes are found. |
| lymphocytes | A type of white blood cell that functions in immunity. |
| macrophage | A large, phagocytic cell found in the lymphatic system and surrounding tissues. |
| immune | The ability to resist infection or to overcome the effects of infection. |
| T cell | Any of several types of cells involved in cell-mediated immunity. |
| B cell | Cell involved in humoral immunity. |
| humoral immunity | An immunity to disease involving antibodies. |
| antibody | A protein substance produced to eliminate antigens that have entered the body. |
| cell-mediated immunity | An immunity to disease involving activated cells. |
| helper T cell | A cell that functions in immunity by rapidly repro- ducing itself and causing the production of particular antibodies. |
| cytoxic T cell | A cell that functions in immunity by attack- ing and destroying cells that have been affected by a particular antigen. |
| suppressor T cell | stop the activities of the killer T cells, the helper T cells, and the plasma cells, returning the body to normal operations |
| memory T cell | A cell that functions in immunity by remaining in the circulatory system and dividing rapidly to form cytotoxic and helper T cells when an antigen reappears. |
| AIDS | (acquired immune deficiency syndrome) A disease caused by the human immunodeficiency virus that affects the human immune system. |
| HIV | (human immunodeficiency virus) The virus that causes AIDS. |
| active immunity | An immunity in which a person manufactures the antibodies himself or has activated T cells for a particular antigen. |
| autoimmune disease | A disease in which the immune system pro- duces antibodies and cytotoxic T cells that attack the normal host cells. |
| vaccine | A weakened form of a pathogen used to build immunity by stimulating the body to produce antibodies or activate T cells. |
| passive immunity | An immunity in which an individual has been given antibodies that have been formed by another individual or an animal. |
| serum | The clear fluid (obtained from blood) that contains anti- bodies; used to transfer immunity to another person or animal. |
| allergy | A disorder caused by the body’s producing antibodies when stimulated by natural, nonpathogenic substances. |
| histamine | A compound produced by the body and released as part of an allergic reaction, resulting in inflammation. |
Created by:
crivera
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