Which of the following is not included in sec | vedclass

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(D) Lymphoid organs are the sites where origin and/or maturation and proliferation of lymphocytes occur.Primary lymphoid organs include the bone marro

Vedclass · Accepted Answer

Thymus

Vedclass · Answer

(D) Lymphoid organs are the sites where origin and/or maturation and proliferation of lymphocytes occur.Primary lymphoid organs include the bone marrow and thymus,where immature lymphocytes differentiate into antigen-sensitive lymphocytes.Secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen,which then proliferate to become effector cells.Examples of secondary lymphoid organs include the spleen,lymph nodes,tonsils,Peyer's patches of the small intestine,and the appendix.Since the thymus is a primary lymphoid organ,it is not included in the secondary lymphoid organs.

List-$I$	List-$II$
$(a)$ $IgG$	$(i)$ Protection of body surfaces
$(b)$ $IgA$	$(ii)$ Regulation of allergic reactions
$(c)$ $IgM$	$(iii)$ Activates $B$-cells
$(d)$ $IgD$	$(iv)$ Protection of body fluids
$(e)$ $IgE$	$(v)$ Protection of blood circulation

Which of the following is not included in secondary lymphoid organs?

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