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Chapter 9
Anatomy and Physiology
| Term | Definition |
|---|---|
| antibody | Protective protein produced by B lymphocytes in response to presence of a foreign substance called an antigen |
| antigen | Substance recognized as harmful to the host and stimulates formation of antibodies in an immunocompetent individual |
| bile pigments | Substances derived from the breakdown of hemoglobin, produced by the liver, and excreted in the form of bile |
| cytokines | Chemical substances produced by certain cells that initiate, inhibit, increase, or decrease activity in other cells |
| extracellular fluid | All body fluids found outside cells, including interstitial fluid, plasma, lymph, and cerebrospinal fluid |
| host | Organism that maintains or harbors another organism |
| mmunocompetent | Ability to develop an immune response, or the ability to recognize antigens and respond to them |
| natural killer cells | Specialized lymphocytes that kill abnormal cells by releasing chemicals that destroy the cell membrane causing its intercellular fluids to leak out |