immunology allergic disorders
Overview of the Immune System
Acquired immunity
Acquired (adaptive) immunity requires prior exposure to an antigen to be fully effective and takes time to develop after the initial encounter with a new invader. Thereafter, response is quick. The system remembers past exposures and is antigen-specific. Components include B cells T cells Acquired immunity includes Derived from B cells (B cells develop into plasma cells, which secrete soluble antigen-specific antibody) Derived from certain T cells None B cells and T cells work together to destroy invaders. Tissue-based Antigen-Presenting Cells are needed to present antigens to most types of T cell. 