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21 terms

Lymphatic and Immune System

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lymph
clear, watery fluid formed from interstitial fluid
lymph node
a mass of tissue found along the course of a lymph vessel
lymphocytes
cells that are important in fighting infection and multiply rapidly when they come into contact with an antigen-- primary cells of the immune system (T and B)
antigen
foreign substance
skin and mucous lining
first defense against foreign substances
phagocytes
engulf antigens
complement proteins
lyse the cell wall of the antigen
interferons
inhibit viral replication and activate surrounding cells that have antiviral actions
inflammatory response
series of events in response to antigen invasion or physical injury
MHC markers
on the plasma membrane of cells -- distinguish between self and nonself cells
T-cells
recognize foreign antigen MHC markers on cell surface--multiply and give rise to clones
memory T-cells
recognize bacteria or viruses that they have encountered before
helper T-cells
activate B-cells and other T-cells to respond to infected cells
cytotoxic T-cells
recognize and kill infected cells
cell-mediated response
activation of T-cells
T-cells
made in bone marrow, mature in thymus
humoral immunity
when B-cells encounter antigen presenting cells with foreign MHC markers, they are activated and produce clones
memory B-cells
produce antibodies that bind to the antigens that originally activated them
AIDS
disease that interferes with immune system-- wipes out helper T-cells-- people die of infections
B-cells
produce antibodies
T-cells
fight infection and help B-cells