IMMUNOLOGY

Detailed explanation-1: -Specialized cells known as memory T and B cells, and long-lived effector B cells (plasma cells), which constitutively secrete high-affinity ‘neutralizing’ antibodies, are the basis of immunological memory.

Detailed explanation-2: -Effector B cells are called plasma cells and secrete antibodies, and activated T cells include cytotoxic T cells and helper T cells, which carry out cell-mediated responses. The production of effector cells in response to first-time exposure to an antigen is called the primary immune response.