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