what are the functions of t helper cells
Lymphocytes are different from other types of white blood cells because they recognize and remember invading bacteria and viruses. T lymphocytes, or T cells, are responsible for cell-mediated immunity. T cells come in many types with specific functions, including: 1  Helper T cells direct the immune system. 2  Cytotoxic T cells release certain chemicals that break open to kill invading organisms. 3  Memory T cells remain after this process to help the immune system respond more quickly when the same organism is encountered again. 4  Suppressor T cells do ...