THE HUMAN IMMUNE SYSTEM
IMMUNE RESPONSE
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Detailed explanation-1: -All adaptive immune responses develop in steps, consisting of: antigen recognition; activation of specific lymphocytes to proliferate and differentiate into effector and memory cells; elimination of the antigen; and decline of the response, with memory cells being the long-lived survivors.
Detailed explanation-2: -Type I: reaction mediated by IgE antibodies. Type II: cytotoxic reaction mediated by IgG or IgM antibodies. Type III: reaction mediated by immune complexes. Type IV: delayed reaction mediated by cellular response.
Detailed explanation-3: -The adaptive immune response is driven by the activities of cells called antigen-presenting cells (APCs). Three cell types can serve as APCs-dendritic cells, macrophages and B cells. Of these, dendritic cells are the most common and powerful APC type.
Detailed explanation-4: -Humans have three types of immunity-innate, adaptive, and passive: Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection.