Immune System Flashcards
a nonspecific response to pathogens by the immune system
innate defense
a specific response by the immune system to a given pathogen
adaptive defense
a collection of nonspecific barriers and cellular responses that serve as an inborn first and second line of defense against pathogens
innate immune system
a kind of passive or active immunity in which antibodies to a particular antigen are present in the body
adaptive immune system
lymphocytes that mature in bone marrow and make antibodies in response to antigens
B cells
white blood cells that mature in the thymus and participate in an immune response
T cells
microscopic organisms that live in or on the human body without causing it harm
commensal micro-organisms
a white blood cell secretion that triggers capillary permeability and vasodilatation
histamine
proteins secreted by leukocytes when they are infected with viruses
interferons
substance that kills or inhibits growth of micro-organisms with minimal damage to the host
antimicrobial
substances on the surfaces of agents that act to identify them, to the body, as being native or foreign
antigens
cell that displays foreign antigens with major histocompatibility complexes on their surfaces
antigen-presenting cell
a type of lymphocyte that secretes interleukins, a protein that triggers the action of other cells, including the attack of foreign cells by the cytotoxic T cell
helper T cell
the category of lymphocyte that attacks foreign cells
cytotoxic T cells
the category of lymphocyte that attacks foreign cells
cytotoxic T cells
