Final answer:
B cell follicles house memory B cells that retain information about pathogens and plasma cells that produce antibodies. Memory B cells provide a stronger response upon re-exposure to the antigen, while plasma cells are terminally differentiated cells that produce antibodies until they die.
Step-by-step explanation:
B cell follicles are specialized structures within secondary lymphoid organs where B cells can encounter antigens and receive help from follicular helper T cells. In these follicles, you will find mainly two types of B cells: memory B cells and plasma cells. Memory B cells are responsible for retaining information about a particular pathogen, ensuring that during a subsequent exposure, the immune response can be stronger and quicker. Plasma cells, on the other hand, are responsible for producing antibodies to combat the pathogen. After their activation and differentiation, plasma cells eventually leave the follicles and often migrate back to the bone marrow to continue their antibody secretion.