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Immune System Vocab

TermDefinition
pathogen a tiny organism that causes disease
immune response the third line of defense in which the immune system reacts to each pathogen with a specific defense for that pathogen
pasturization a heating process used to kill microorganisms in food such as milk and yogurt
infectious disease a disease that can be passed from one organism to another
inflammatory response the body’s response to pathogen in which fluid and white blood cells leak from blood vessels
phagocyte a white blood cell that engulfs pathogens and destroys them by breaking them down
lympocyte a white blood cell that reacts to each pathogen with a specific response
T cell cells that identify pathogens and distinguish one from another
B cell a lymphocyte that produces chemicals to destroy a specific kind of pathogen
antigen a molecule on a cell that the immune system can recognize as part the body or coming from outside the body
antibody a chemical produced by a B cell that destroys a specific kind of pathogen
immunity the body’s ability to destroy pathogens before they cause disease
active immunity immunity that occurs when a persons immune system produces antibodies in response to the presence of a pathogen
vaccination the process by which harmless antigens are deliberately produced to a person’s body to produce active immunity
vaccine a substance used in a vaccination that consists of pathogens that have been weakened or killed but can still trigger the immune system into action
passive immunity the immunity in which the antibodies that fight disease come from another organism rather than your own body
antibiotic a chemical that kills bacteria or slows the growth without harming body cells
allergy a disorder in which the immune system is overly sensitive to a foreign substance- something not found in the body
allergen any substance that causes an allergy (pollen, dust mites)
histamine a chemical that is responsible for the symptoms of an allergy (watery eyes, sneezing)
Created by: mdonahoe18
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