CH 30 Allergic Reactions
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Created by:
kewlhandlewk on January 25, 2010
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27 terms
Terms | Definitions |
|---|---|
 absorbtion | in allergic reactions, when foreign material is deposited on and moves into the skin |
| acquired immunity | the immunity the body developes as part of exposure to an antigen |
| allergen | a substance that produces allergic symptoms in a patient |
| allergic reaction | an abnormal immune response the body developes when reexposed to a substance or allergen |
| anaphalaxis | an extreme systemic form of an allergic reaction involving two or more body systems |
| antibody | a protein the body produces in response to an antigen; animmunoglobulin |
| antigen | an agent that, when taken into the body stimulates the formation of specific protective proteins called antibodies. |
| basophils | white blood cells that work to produce chemical mediators during an immune response |
| cellular immunity | the immunity provided by special white blood cells called T cells that attack and destroy invaders |
| chemical mediators | chemicals that work to cause the immune or allergic response, for example, histamine |
| histamine | a chemical found in mast cells that, when released, causes vasodilation, capillary leaking, and bronchiole constriction |
| humoral immunity | the use of antibodies disolved in the plasma and lymph to destroy foreign substance |
| hypersensitivity | occurs when a patient reacts with exaggerated or inappropriate allergic symptoms after coming into contact with a substance the body perceives as harmful |
| immune system | the system that protects the body from foreign substances |
| immunity | the bodys ability to protect itself from acquiring a disease |
| ingestion | eating or drinking materials for absorption through the gestational tract |
| inhalation | in allergic reactions, foreign substances are breathed in through the respiratory system |
| injection | in allergic reactions, when the skin is pierced, and foreign material is deposited into the skin |
| local reaction | when a body limits a response to a specific area after being exposed to a foreign substance |
| mast cells | basophils that are located in the tissues |
| natural immunity | the immunity the body develops as part of being exposed to an antigen and developing antibodies for example, exposure to measles, havinfg the measles and developing immunity to the measles |
| primary response | the first encounter with the foreign substance to begin the immune response |
| pruritis | itching |
| secondary response | the bodys reaction when it is exposed to an antigen for which it already has antibodies, in which it responds by killing the invading substance |
| sensitivity | the ability to recognize a foreign substance the next time it is encountered |
| systemic reaction | a reaction that occurs throughout the body, possibly affecting multiple body systems |
| urticaria | hives or reddened elevated patches on the skin |
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