Ck 12: Life Science: Immunity

[Free Registration/Login may be required to access all resource tools.] Most B and T cells die after an infection has been brought under control. But some of them survive for many years. These long-lasting B and T cells are called memory cells. If the pathogen invades the body again, the memory cells will start dividing in order to fight the pathogen or disease. Learn more about immunity in this learning module produced by CK-12.