Secondary lymphoid organs, such as the lymph nodes, spleen, and mucosa-associate

Question

Secondary lymphoid organs, such as the lymph nodes, spleen, and mucosa-associated llymphoid tissues, each have distinct features that are important for their role in initiating immune responses focused on different anatomical compartments (i.e., the peripheral tissues, the blood, or the gastroinestinal tract, respectively). yet these organs share some overall structural features, such as distinct T-cell and B- cell zones. One major difference between these organs is:

A. the presnce versus the absence of macrophages and dendritic cells

B.their function in bringing rare naive lymphocytes into contact with their specific antigen

C. the ability of lymphocytes to enter the organ from the blood

D. the mechanism by which antigens or pathogens enter the organ

E the ability of naive T cells to be activated and proliferate in the organ

Explanation / Answer

Correct answer:- (E) the ability of native T cell to be activated and proliferate in the organ.

Explanation:- Secondary lymphoid organs are the sites in which naive B and T cells recognize antigen and launch an immune response. The tissues include lymph nodes, the white pulp of the spleen, and mucosa-associated lymph tissues (MALT) of the respiratory, gastrointestinal and urogenital tracts.

- these all are different in mechanism of activation of lymphocytes.

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