GENERAL HISTOLOGY

Detailed explanation-1: -During the secondary immune response, these cells are involved in the reaction against foreign antigens, including pathogens, and take part in autoimmune diseases, but also are crucial to immunological tolerance and vaccine therapy.

Detailed explanation-2: -The adaptive, or acquired, immune response takes days or even weeks to become established-much longer than the innate response; however, adaptive immunity is more specific to pathogens and has memory.

Detailed explanation-3: -IgG is the antibody produced by most memory cells, but IgA-and IgE-expressing B cells play an important role in secondary immune response, too.