Long-term immunity against pathogens is provi | vedclass

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(B) Long-term immunity,also known as immunological memory,is provided by memory cells.When the body is first exposed to a pathogen (primary response),

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Memory cells

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(B) Long-term immunity,also known as immunological memory,is provided by memory cells.When the body is first exposed to a pathogen (primary response),some $B$ and $T$ lymphocytes differentiate into memory cells.These memory cells persist in the body for a long time.Upon subsequent exposure to the same pathogen,these memory cells recognize the antigen rapidly and initiate a secondary immune response,which is much more intense and faster than the primary response.

Column-$I$	Column-$II$
$(a)$ Main lymphoid organ	$(1)$ Thymus
$(b)$ $MALT$	$(2)$ Spleen
$(c)$ Lobe-like organ arranged near heart	$(3)$ Bone marrow
$(d)$ Large bean-shaped organ	$(4)$ It constitutes $50\%$ of lymphoid tissue

Long-term immunity against pathogens is provided by which of the following?

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Match the columns:

Column-$I$ Column-$II$

$(a)$ Main lymphoid organ $(1)$ Thymus

$(b)$ $MALT$ $(2)$ Spleen

$(c)$ Lobe-like organ arranged near heart $(3)$ Bone marrow

$(d)$ Large bean-shaped organ $(4)$ It constitutes $50\%$ of lymphoid tissue

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