Immunological Memory
For more details on this topic, see Immunity (medical).When B cells and T cells are activated some will become memory cells. Throughout the lifetime of an animal these memory cells form a database of effective B and T lymphocytes. Upon interaction with a previously encountered antigen, the appropriate memory cells are selected and activated. In this manner, the second and subsequent exposures to an antigen produce a stronger and faster immune response. This is "adaptive" because the body's immune system prepares itself for future challenges. Immunological memory can either be in the form of passive short-term memory or active long-term memory.
Read more about this topic: Adaptive Immune System
Famous quotes containing the word memory:
“Those who believe in their truth—the only ones whose imprint is retained by the memory of men—leave the earth behind them strewn with corpses. Religions number in their ledgers more murders than the bloodiest tyrannies account for, and those whom humanity has called divine far surpass the most conscientious murderers in their thirst for slaughter.”
—E.M. Cioran (b. 1911)