The importance of specificity and memory in the acquired immune system is cellular immunity that helps fight individual battles with pathogens called T cells. Helps fight foreign, tumor cells and hosts, but also attacks transplanted tissues. Humoral immunity involves antibody-mediated B cells that are never involved in the battle. They release antibodies into body fluids, move away and send chemicals to attack pathogens, meaning they are not directly involved in the battle. When you are exposed to a variety of pathogens, you remember them and retain acquired immunity. This means that the body has memory cells, which provide immunity to future exposure to the virus