Lymphocyte and the immune response:
white blood cells called lymphocytes
T lymphocyte mature in thymus gland
T helper cells, produce interleukins, type of cytokine (cell-signalling molecule)
interleukins stimulate activity of B cells = increase antibody production
T killer cells, destroy pathogen carrying antigen
produce chemical = perforin, kills pathogen by making holes in the cell membrane
if meet antigen second time, rapidly form huge number of clones of T killer cells