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Chapter 16

Lymphatic and Immune System

TermDefinition
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