PATHOLOGY

Detailed explanation-1: -The ability to change the isotype of antibody produced (class switching) by a B cell also occurs in germinal centres and requires AID. In a secondary response to the same antigen, memory cells are rapidly activated. This process is quicker and more effective than the primary response.

Detailed explanation-2: -A primary immune response results in the generation of memory immune cells. A secondary immune response occurs as a result of a second exposure to an antigen. It is a much more rapid and sustained response due to the action of memory immune cells.

Detailed explanation-3: -How is the secondary response different from the primary response in terms of antibody concentration in the blood? The secondary response is slower, but produces more antibodies than the primary response.

Detailed explanation-4: -Secondary immune response is quicker and stronger than the primary one.