What plays an important role in primary and s | vedclass

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(C) The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our body,namely $B$-lympho

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Both $B$-lymphocytes and $T$-lymphocytes

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(C) The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our body,namely $B$-lymphocytes and $T$-lymphocytes.$B$-lymphocytes produce an army of proteins in response to pathogens in our blood to fight against them. These proteins are called antibodies.$T$-lymphocytes themselves do not secrete antibodies,but they help $B$-lymphocytes to produce antibodies. Thus,both types of lymphocytes play a crucial role in the immune response.

Column-$I$	Column-$II$
$P$. Physical barriers	$I$. Acid in stomach,saliva in mouth,tears from eyes
$Q$. Physiological barriers	$II$. Skin,mucus coating of epithelium lining the respiratory,gastrointestinal and urogenital tracts
$R$. Cellular barriers	$III$. Interferons
$S$. Cytokine barriers	$IV$. Polymorphonuclear leukocytes ($PMNL$-neutrophils),monocytes,$NK$ cells,macrophages

What plays an important role in primary and secondary response?

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