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Q.

Which of the following act as cellular barrier?

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a

Mucus coating of gastrointestinal tract

b

Interferons

c

Lysozyme 

d

Polymorphonuclear leukocytes

answer is B.

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Detailed Solution

Polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes. They act as cellular barriers.

Lysozyme is an example of physiological barrier.

Interferon is an example of cytokine barrier.

Mucus coating the gastrointestinal tract is an example of physical barrier.

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