Immune System Flashcards
_ is a functional system that provides disease resistance
immune system
_ immune system has the first and second lines of defense
innate (nonspecific)
_ line of defense involves external body membranes (skin, mucosa)
first
_ line of defense involves antimicrobial protein, phagocytes, and other cells
second
_ immune system has the third line of defense
adaptive (specific)
_ line of defense attacks particular foreign substances
third
_ are disease-causing organisms
pathogens
_ - skin and mucous membranes - stop attacks from pathogens
surface (mechanical) barriers
_ (enzymes in saliva, respiratory mucus, lacrimal fluid) destroys bacteria
lysozymes
_ are white blood cells that ingest-digest (eat) foreign invaders (ex: neutrophils, macrophages)
phagocytes
_ are large granular lymphocytes that police blood and lymph
natural killer (NK) cells
_ are non-phagocytic; can kill cancer and virus-infected cells
NK cells
_ is caused by vasodilation in inflammatory response
hyperemia
_ is caused by congestion with blood; leads to redness and heat
hyperemia
_ is caused by increased capillary permeability
exudate
_ is a fluid containing clotting factors + antibodies and leaks into tissue
exudate
exudate can cause _ (local swelling), which pushes on nerve endings and causes pain
edema
_ is the release of neutrophils from bone marrow
leukocytosis
leukocytosis is caused by _ from injured cells
leukocytosis-inducing factors
_ is when endothelial cells of capillaries in an inflamed area project CAMs into vessel lumen
margination
_ grab onto passing neutrophils and causes them to slow / roll along; cling to vessel wall
cell adhesion molecules (CAMs)
_ is when neutrophils squeeze between endothelial cells and move into interstitial spaces
diapedesis
_ is when inflammatory chemicals act as chemotactic agents
chemotaxis
inflammatory chemical agents promote _ of neutrophils toward injured area
positive chemotaxis
_ enhance innate defense, attack microorganisms directly, or stop microorganisms from reproducing
antimicrobial proteins
_ are a family of immune proteins
interferons (IFNs)
cells infected with viruses can secrete IFNs to
“warn” _
healthy neighboring cells
_ enter neighboring cells to stimulate production of proteins that block viral reproduction / degrade viral RNA
interferons (IFNs)
_ are ~20 antimicrobial proteins (c1-9, regulatory proteins, and factors b d p) circulating in inactive form in blood
complement
_ immunity includes antibodies and temporarily bind to target cells
humoral
_ immunity includes [T] lymphocytes that act against target cell and has cellular targets
cellular (cell mediated)
_ are anything that provokes an immune response
antigens
antigens are targets of _
adaptive immune responses
_ have immunogenicity and reactivity (ex: foreign proteins, polysaccharides, lipids, nucleic acids)
complete antigens
_ stimulates proliferation of specific lymphocytes
immunogenicity