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Immune System, *3 types of ANTI:, -AntiGen: something foreign to the body,…

- - - - Helper T-cells involved.
        
        The antigen from the pathogen is on the cell membrane of the cell. It binds a helper T cell which stimulates a white blood cell known as B cell.
        
        3rd line of defende
        
        Part of the cell-mediated and humoral responses
      - B cells
        
        Produce ANTIBODIES
        
        Y shaped proteins with an antigen binding area
        
        Found in blood, breast milk, saliva and breast milk
        
        Very specific, different antibodies for different ensantig
        
        Part of the 3rd line of defense
    - - Involves the cytotoxic T cell
        
        Which is a white blood cell that destroys cells infected by the pathogen, by releasing signals that causes the infected cell to do apoptosis. This is a type of self destruct. The cell is destroyed/can no longer replicate.
        
        Releases protein perforin, which causes holes in cell membrane, leading to water and ions flowing into it and destroying it.
        
        It needs to be activated to function, either by a previous infected cell or by a helper T cell which releases chemical signals.
    - - keep memory of the pathogens they were exposed to
        
        Vaccines->deactivated or weakened pathogens that are introduced to the body for the immune system to attack and learn how to confront it
      - Activate B cells and cytotoxic T cells