PYSO 001 Lecture Notes - Lecture 7: Cytotoxic T Cell, Herd Immunity, Moe Williams
12 May 2020
School
Department
Course
Professor
Document Summary
Activing b & t cells and immunological memory. B-cells, antibodies and cytotoxic t cells are effective, but very slow the first time they encounter a new pathogen. Helper t cells activate b cells, killer t cells. Once activated, b cells and t cells undergo clonal expansion! Clonal expansion; activated b or t cell divides by mitosis to produce more activated b or t cells and to produce or t memory cells. Activate b & t cells survive long enough to fight the infection. Memory b and t cells live many years or even many decades! Immunological memory: involves memory b and t cells, which allow for quick intense response following any subsequent exposure to previously exposed antigen. Acquired immune responses: primary response: acquired immune response to initial exposure to antigen. Slower, less intense response usually symptoms of infection are apparent because body takes a while to respond.
