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A&P1-11 Lymphatic Sy

Ch 11: Lymphatic System

TermDefinition
Acquired immunity How forms of specific immunity are acquired (Ex: natural active immunity, natural passive immunity, artificial active immunity, and artificial passive immunity)
Acquired immunodeficiency syndrome (AIDS) Final stage of an HIV infection, in which the immune system fails to provide protection against pathogen
Anaphylaxis Systemic vasodilation (system wide dilation of blood vessels) that occurs within a few minutes of exposure to an allergen and can cause a drop in blood pressure and even cardiac failure
Antigen-presenting cell (APC) A cell that samples its environment and posts what it finds. (Ex: B cells and macrophages)
Cellular immunity Form of specific immunity that involves Tcytotoxic cells directly attacking cells with a foreign antigen.
Chemotaxis Process in which WBC’s move to where the concentration of chemicals from damaged tissues is the greatest
Complement system 20 inactive proteins (always present in the blood) that, when activated by the presence of a pathogen, initiate one of several pathways to ensure pathogen destruction.
Diapedesis Process in which WBC’s crawl through vessel walls
Epitope Antigen fragment
Humoral immunity Form of specific immunity that involves B cells making antibodies to attack a foreign antigen. Also called antibody-mediated immunity
Interferons Chemicals that are released by virally infected cells and encourage surrounding healthy cells to make antiviral proteins so that the virus will not invade them
Interleukins Chemicals used by lymphocytes to communicate with one another
Lymph Fluid that is derived from blood and is similar to plasma but has fewer proteins
Lymphadenitis Condition in which a pathogen is under attack by a lymph node's lymphocytes, resulting in the lymph node becoming swollen and painful to the touch
Major histocompatibility complex (MHS) Protein molecule used by antigen-present cells (APC) to display an epitope
Margination Process in which WBC’s stick to the walls of dilated vessels in an inflamed area
Molecular mimicry A situation in which one molecule is so similar in structure to another molecule that it is mistaken for the other molecule
Nonspecific resistance Type of defense that works to fight a variety of pathogens without the need for prior exposure (consists of two lines of defense: external barriers & inflammation, antimicrobial proteins, fever, and other active attacks)
Pyrogen Chemical that initiates a fever
Specific immunity A line of defense that requires a prior exposure to a specific pathogen so the system can fight it off faster and stronger if the pathogen ever occurs in the body again (process is to recognize, react, and remember the pathogen)
Created by: teribere