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22 terms

Immune System

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macrophage
a large white blood cell that engulfs pathogens and cellular debris
bacteria
single-celled organisms that lack a nucleus; prokaryotes
lysosomes
cell organelle filled with enzymes needed to break down certain materials in the cell
interleukin
a protein produced by certain white blood cells that regulates immune responses by activating lymphocytes and initiating fever
virus
a nonliving, infectious particle composed of a nucleic acid and a protein coat; it can invade and destroy a cell
specific immunity
the third line of defense. the body's way of fighting off specific things that invade your body
helper T cell
a type of lymphocyte that works with B cells to increase antibody production by plasma cells, and stimulates the proliferation of both T cells and B cells
antigen
A protein that, when introduced in the blood, triggers the production of an antibody
nonspecific defense
physical or chemical barrier that prevents pathogens from entering the body
suppressor T cells
suppress the immune response once a foreign antigen has been destroyed
inflammation
Nonspecific defensive response of the body to tissue injury, including dilation of blood vessels
natural killer cells
A type of white blood cell that can kill tumor cells and virus-infected cells; an important component of innate immunity.
killer T cells
look for infected cells and kill them (your own cells that are infected) to prevent the spread of pathogens
leukocytes
White blood cells
vaccine
A weakened or inactive version of a pathogen that stimulates the body's production of antibodies which can aid in destroying the pathogen
memory B cells
cells in your immune system that remember how to make an antibody for a particular pathogen
B cell growth factor
encourages B lymphocytes to multiply
lyphokines
mobilize and activate macrophages against tumor cells
antibody
specialized protein that helps destroy disease-causing organisms
MHC
major histocompatibility complex; found in the plasma membrane; alerts T cells that a cell is infected w/ a virus
Passive immunity
an immunity resulting from antibodies that are conveyed naturally through the placenta to a fetus or artificially by injection of a serum containing antibodies
Acquired Immunity
immunity that the body develops after it overcomes a disease, or through inoculation (such as vaccination)