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The mucus coating that traps micro-organisms lines the epithelium of which tracts?
ARespiratory, gut and urogenital
BRespiratory and circulatory
CGastrointestinal and nervous
DUrogenital and skeletal
Answer & Solution
Correct answer: A. Respiratory, gut and urogenital
1. Skin is the main physical barrier against micro-organisms.
2. Where there is no skin, mucus does the work.
3. The mucus coating lines the epithelium of the respiratory, gastrointestinal and urogenital tracts.
4. It traps micro-organisms entering the body at those openings.
_Source: NCERT Class 12 Biology Ch7 'Human Health and Disease', section 7.2.1_
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