T cell and B Cell action

• T cell
• T_h cells: T helper cells which bind to foreign antigens on an antigen presenting cell (APC) and secrete cytokines, hereby initiating an immune system response.
• T_c cells: T cytotoxic cells, which bind to the infected cell and secretes the cytotoxins perforin and granulysin and thus lysing the cell, killing it.
• T_s cells: T suppressor cells, which shutdown the immunity system after the infection has been eliminated from the body.

B cells, upon detecting the presence of cytokines, take residence in the spleen or lymphnode  divide and differentiate into two types of cells: 

• Plasma cells; which secrete antibodies
• Memory cells; which persist in the body in case there is a recurrent infection with the same disease, then a faster and more efficient immune response would occur.