MICROANATOMY

Detailed explanation-1: -Adaptive immunity has a memory component that primes the body to respond to a second instance of infection by the same pathogen more rapidly and more effectively than the first time it occurred. The primary immune response occurs after the first exposure to an antigen.

Detailed explanation-2: -IgM is the first antibody produced in primary immune response.

Detailed explanation-3: -The induction of an adaptive immune response begins when a pathogen is ingested by an immature dendritic cell in the infected tissue. These specialized phagocytic cells are resident in most tissues and are relatively long-lived, turning over at a slow rate.

Detailed explanation-4: -During the first encounter with a virus, a primary antibody response occurs. IgM antibody appears first, followed by IgA on mucosal surfaces or IgG in the serum. The IgG antibody is the major antibody of the response and is very stable, with a half-life of 7 to 21 days.