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26 Cards in this Set

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  • Back
pathogens
organisms that cause diseases
infectious disease
a disease that can pass from one person to another
pasteurization
a heating process that is widely used to kill microorganisms in food products such as milk
phagocyte
a white blood cell that engulfs pathogens and destroys them by breaking them down
inflammatory response
part of the body's defense against pathogens, in which fluid and white blood cells leak from blood vessels into tissues; the white blood cells destroy pathogens by breaking them down
immune response
part of the body's defense against pathogens in which cells of the immune system react to each kind of pathogen with a defense targeted specifically at that pathogen
lymphocyte
white blood cell that reacts to each kind of pathogen with a defense targeted specifically at that pathogen
T cell
a lymphocyte that identifies pathogens and distinguishes one pathogen from another
antigen
a molecule on a cell that the immune system can recognize either as part of the body or as coming from outside the body
B cell
a lymphocyte that produces chemicals that help destroy a specific kind of pathogen
antibody
a chemical produced by a B cell of the immune system that destroys a specific kind of pathogen
AIDS
(aquired immunnodeficiency syndrome) a disease caused by a virus that attacks the immune system
immunity
the ability of the immune system to destroy pathogens before they can cause diseases
active immunity
immunity that occurs when a person's own immune system produces antibodiesin response to the presence of a pathogen
vaccination
the process by which harmless antigens are deliberately introduced into a person's body to produce active immunity
vaccine
a substance used in vaccination that consists of pathogens that have been weakened or killed but can still trigger the immune system into action
passive immunity
immunity in which the antibodies that fight a pathogen come from another organism rather than from the person's own body
antibiotic
a chemical that kills bacteria or slows their growth without harming the body cells of humans
noninfectious disease
a disease that does not spread fom person to person
allergy
a disorder in which the immune system is overly sensitive to a foreign substance
histamine
a chical that is responsible for the syptoms of an allergy
asthma
a disorder in which the respiratory passages narrow significantly
insulin
a chical produced in the pancreas that enables the body's cells to take in glucose from the blood and use it for energy
diabetes
a condition in which either the pancreas fails to produce enough insulin, or the body' cells can't use it properly
tumor
a mass of abnormal cells that develop when cancerous cells divide and grow uncontrollably
carcinogen
a sudstance or a factor in the environment that can cause cancer