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circulate in the blood in their inactive form; attaches to the bacterium's outer membrane and punches holes in it;
holes in the membrane allow fluid and electrolytes to flow into the bacterium, causing it to burst and die
natural killer cells
special type of lymphocyte that acts nonspecifically to kill a variety of cells
killer t cells
destroy the antigen(pathogen) through the use of punching holes in the pathogen's cell membrane and secreting substances
helper t cells
secrete a lymphokine that stimulates T cells and B cells and in general enhances the immune response
antibody found in plasma and body fluids; particularly effective against certain bacteria, viruses and toxins
antibody found in blood plasma; anit-A and anti-B antibodies associated with red blood cells
antigen-bearing subtance such as a pathogen, injected into a person in an attempt to stimulate antibody production
naturally acquired immunity
long acting; body produces antibodies against an invader once it is exposed to it
passive acquired immunity
short acting; happens when a person is given an antitoxin or antiserum containing antibodies or antitoxins
naturally acquired passive immunity
fetus receive antibodies from mother thru placenta or breast feeding
artificially acquired immunity
introduction of killed or live pathogens that have reduced virulence that is recognized as antigens by the immune system but are not able to cause disease
antibodies that neutralize the toxins secreted by the pathogens but have no effect on the pathogens themselves
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