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Question

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
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B
Mucus membrane lining the respiratory, gastrointestinal and urogenital tracts helps in trapping the microbes and constitute physiological barriers of our body
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C
Certain types of leucocytes such as polymorpho-nuclear leucocytes (PMNL-neutrophils) and lymphocytes such as natural killer cells, constitute cellular barriers of our body
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D
Virus infected cells secrete proteins called interferons which protect non-infected cells from further viral infection and constitute cytokine barriers of our body
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Solution

The correct option is B Mucus membrane lining the respiratory, gastrointestinal and urogenital tracts helps in trapping the microbes and constitute physiological barriers of our body
Physical barriers provide a physical block against pathogens from entering the body. Mucus membrane lining the respiratory, gastrointestinal and urogenital tracts helps in trapping the microbes and constitutes physical barriers of our body.

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