2.51 describe how the immune system responds to disease using white blood cells, illustrated by phagocytes ingesting pathogens and lymphocytes releasing antibodies specific to the pathogen

2.51 •phagocytes ingest pathogens 

                  •they detect foreign things engulf them

                  •they are non-specific, attacking anything not meant to be there

         

         •lymphocytes produce antibodies 

                   •pathogens have unique molecules called antigens on it’s surface

                   •they start will produce proteins called antibodies, locking on to pathogens, marking them out for destruction by other white blood cells. They antibodies are specific to that type                     of antigen - they won’t lock on to others. 

                   •antibodies are produced rapidly and flow around the body, marking all similar ones

                             •some lymphocytes stay around in the blood as memory cells

                                       •they can reproduce these very fast if the same antigen enters again