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Chapter 16
Lymphatic and Immune System
| Term | Definition |
|---|---|
| active immunity | immunity that results when the body manufactures its own antibodies or T cells against a pathogen |
| allergen | environmental substance that triggers an allergic response |
| anaphylaxis | severe, immediate hypersensitivity reaction affecting the entire body |
| antibody | substance produced by the B lymphocytes in response to a specific antigen |
| antigen | any molecule that triggers an immune response |
| cellular immunity | immune response that targets foreign cells or host cells that have become infected with a pathogen |
| chemotaxis | the movement of white blood cells to an area of inflammation in response to the release of chemicals from the injured cells |
| complement | a group of proteins in the blood that, through a cascade of chemical reactions, participate in nonspecific immunity |
| histamine | substance secreted by injured or irritated cells that produces local vasodilation, among other effects |
| humoral immunity | immune response that uses antibodies to target pathogens outside the host cells |
| hyperemia | increased blood flow to an area |
| immunoglobulins | antibodies |
| inflammation | an immunological response to injury, infection, or allergy, marked by increases in regional blood flow, immigration of white blood cells, and release of chemical toxins |
| interferon | protein released from virus-infected cells that helps protect nearby cells form invasion |
| lymph | clear, colorless fluid filling lymphatic capillaries |
| lymph nodes | kidney shaped masses of lymphatic tissue that lie alone the lymphatic vessels |
| macrophages | important phagocyte that remains fixed in strategic areas |
| natural killer cells | unique group of lymphocytes that continually roam the body seeking out pathogens or diseased cells |
| neutrophils | phagocytes that accumulate rapidly at sites of acute injury |
| nonspecific immunity | first and second line of defense, immune response aimed at a broad range of pathogens |
| passive immunity | immunity that results when someone receives antibodies form another person or animal |
| phagocytosis | process by which phagocytes engulf and destroy microorganisms |
| pyrexia | fever |
| specific immunity | the third line of defense; immune response targeted at a specific pathogen |
| spleen | the body's largest lymphatic organ; contains masses of lymphocytes |
| T lymphocytes | lymphocytes that participate in both cellular and humoral immunity; also called T cells |
| thymus gland | lymphoid organ where T cells mature; located in the mediastinal cavity |
| tonsils | masses of lymphoid tissue that form a protective circle at the back of the throat |
Created by:
lindstromjPN110
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