Which of the following statements regarding different barriers of innate immunity is not correct?
(A)Acid present in the stomach, saliva in the mouth, tears from the eyes prevent the growth of microorganisms and constitute physiological barriers of our body
(B)Mucous membrane lining the respiratory, gastrointestinal and urinogenital tracts helps in trapping the microbes entering the body and constitute physiological barriers of our bodyCorrect
(C)Certain types of leucocytes such as polymorpho-nuclear leucocytes and natural killer cells, constitute cellular barriers of our body
(D)Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection and constitute cytokine barriers of our body
Answer: (B)
Solution
The skin and the mucous membrane lining the respiratory, gastrointestinal and urinogenital tracts, which trap microbes by forming a physical barrier to their entry, are correctly classified as physical
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