A patient develops a virulent staphylococci infection of the right leg. The circulating lymphocyte containing the antigenic message returns to the nearest lymph node. This is known as the:
A) Recognition stage
B) Proliferation stage
C) Response stage
D) Effector stage
Ans: B
Feedback: In the proliferation stage, the circulating lymphocyte containing the antigenic message returns to the nearest lymph node. Once in the node, the sensitized lymphocyte stimulates some of the resident dormant T and B lymphocytes to enlarge, divide, and proliferate. The recognition stage of antigens as foreign, or nonself, by the immune system is the initiating event in any immune response. The body must first recognize invaders as foreign before it can react to them. In the response stage, the differentiated lymphocytes function either in a humoral or a cellular capacity. In the effector stage, either the antibody of the humoral response or the cytotoxic (killer) T cell of the cellular response reaches and connects with the antigen on the surface of the foreign invader.
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