Which of the following barriers is NOT includ | vedclass

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Question

(C) Innate immunity is a non-specific type of defense that is present at the time of birth. It consists of four types of barriers:
$1$. Physical barr

Vedclass · Accepted Answer

Chemical barriers

Vedclass · Answer

(C) Innate immunity is a non-specific type of defense that is present at the time of birth. It consists of four types of barriers:
$1$. Physical barriers: e.g.,skin,mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts.
$2$. Physiological barriers: e.g.,acid in the stomach,saliva in the mouth,tears from eyes.
$3$. Cellular barriers: e.g.,polymorpho-nuclear leukocytes ($PMNL$-neutrophils),monocytes,and natural killer cells.
$4$. Cytokine barriers: e.g.,virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.
Since all four options listed (Physical,Physiological,Chemical,and Cellular) are components of innate immunity,the question is technically flawed as all are valid barriers. However,in the context of $NCERT$ classification,'Chemical barriers' are often grouped within 'Physiological barriers'. Therefore,if one must be excluded,'Chemical barriers' is the most appropriate choice.

Which of the following barriers is $NOT$ included in innate immunity?

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