Which of the following are primary lymphoid o | vedclass

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(D) Primary lymphoid organs are the sites where lymphocytes originate and/or mature and differentiate into antigen-sensitive lymphocytes.In humans,the

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Thymus and Bone marrow

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(D) Primary lymphoid organs are the sites where lymphocytes originate and/or mature and differentiate into antigen-sensitive lymphocytes.In humans,the bone marrow and the thymus are the primary lymphoid organs.In these organs,immature lymphocytes differentiate into antigen-sensitive lymphocytes.After maturation,the lymphocytes migrate to secondary lymphoid organs like the spleen,lymph nodes,tonsils,Peyer's patches of the small intestine,and the appendix.

Column-$I$	Column-$II$
$1.$ Saliva and tears	$a.$ Cytokine barrier
$2.$ Mucus coating	$b.$ Cellular barrier
$3.$ $PMNL$	$c.$ Physiological barrier
$4.$ Interferons	$d.$ Physical barrier

Which of the following are primary lymphoid organs?

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Match the following columns:
Column-$I$ Column-$II$
$1.$ Saliva and tears $a.$ Cytokine barrier
$2.$ Mucus coating $b.$ Cellular barrier
$3.$ $PMNL$ $c.$ Physiological barrier
$4.$ Interferons $d.$ Physical barrier

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