List and briefly describe the four steps in the cell-mediated immune response.

1. Antigens invade the body by breaking through one of or protective barriers.
2. Helper T cells recognize the invading antigens and trigger the production of killer T cells and B cells.
3. Killer T cells destroy infected cells. B cells produce antibodies that attach to antigens and mark them for destruction by macrophages.
4. When the threat is over, suppressor T cells stop the activity of the B cells, the killer T cells, and the macrophages. Memory B and T cells are reserved so the body can respond quickly to future attacks by the same antigen.

I appreciate your effort even though it came a little late I checked your answer, and it was consistent with the answer key.