Immune System Terms Flashcards
Antigen-Presenting Cell (APC)
Finds the antigen, digests it, and displays a piece of the antigen that B and T cells can recognize.
Helper T Cell
Requires antigen display and activation; Releases signals to the immune system encouraging a strong response to the antigen
Naïve B Cell
Can recognize an antigen floating freely in the body and mature into an antibody-presenting cell; After it encounters an antigen, it can mature into a cell to produce antibodies (a plasma B cell) or a memory cell (a memory B cell)
Plasma B Cell
Following activation, Naïve B Cells can/will turn into a Plasma B Cell; produces and releases antibodies specific to a particular antigen
Antibodies
Proteins molecules that Plasma B Cells produce; attaches to foreign antigens to inactivate them or trigger other immune cells to engulf or destroy them
Vaccine antigen/Live antigen
Antibodies bind to the vaccine antigen; part of the vaccine that triggers a response
Naïve Killer T Cell
Also receives signals for the Helper T Cells that encourage maturation into active cells; Must be activated by APC before it can find and destroy infected cells
Active Killer T Cell
If a pathogen invades the body cells, ____ can find and destroy infected cells. It can locate, attack, and kill those cells that are infected or presenting an antigen; finds and destroys infected cells
Memory B Cells
Memory B Cells will lead to production of antibodies to fight the invader; detects invaders containing or displaying the antigen used in the vaccine and leads to antibody production
Memory Helper T Cells
Releases signals to alert other cells if the invader is found later; Long after vaccination/sickness, this cell circulates in the body waiting for an APC to present an antigen resembling the vaccine antigen
Memory Killer T Cells
Long after vaccination, attacks and kills cells presenting the real antigen; these cells continue to search for infected cells displaying a pathogen antigen resembling the vaccine/real antigen.
