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Ch 39 Voc
vocab words for ch 39
19
Biology
11th Grade
03/10/2011

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Term
antibiotic
Definition
substances produced by a microorganism, in small ammounts, will kill or inhabit growth and reproduction of other microorganisms
Term
endemic disease
Definition
disease that is constantly present in population
Term
epidemic
Definition
occurs when many people in a given area are afflicted with the same disease at about the same time
Term
infectious disease
Definition
any disease caused by pathogens in the body
Term
Koch's postulates
Definition
experimental steps relating a specific pathogen to a specific disease
Term
pathogen
Definition
disease-producing agents such as bacteria, protozoans, fungi, viruses, and other parasites
Term
acquired immunity
Definition
gradual build-up of resistance to a specific pathogen over time
Term
B cell
Definition
a lymphocyte that, when activated by a T cell, becomes a plasma cell and produces antibodies
Term
innate immunity
Definition
body-s earliest lines of defense against any and all pathogens
Term
interferons
Definition
host-cell specific proteins that protect cells from viruses
Term
lymph
Definition
tissue fluid composed of water and disolved substances from the blood that have collected and entered the lymph vessels
Term
lymph nodes
Definition
small mass of tissue that contains lymphocytes and filters pathogens from the lymph
Term
lymphocyte
Definition
type of white blood cell stored in lymph nodes that defends the body against foreign agents
Term
macrophage
Definition
type of pathogen that engulfs damaged cells of pathogens that have entered the body's tissue
Term
phagocyte
Definition
white-blood cells that destroy pathogens by surrounding and engulfing them
Term
pus
Definition
collection of dead macrophages and body fluids that forms infected tissues
Term
T cell
Definition
lymphocyte produced in bone marrow and processed in the thymus that plays a role in immunity
Term
tissue fluid
Definition
fluid that bathes the cells of the body
Term
vaccine
Definition
substance consisting of weakened, dead, or incomplete portions of pathogens or antigens that produce an immune response when injected in the body
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