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Busy at Work – Our Internal Organs — EVS STD 5 — Question

Maharashtra BoardEnglish MediumSTD 5EVSBusy at Work – Our Internal Organs3 Marks
Question
Harmful substances like dust, smoke and microorganisms present in the air cannot reach the lungs.
✓

Answer

The inner lining of the nose has thin hair-like structures called cilia. This inner lining also secretes a sticky substance called mucus. The harmful substances like dust, smoke, micro-organisms etc. are filtered by the cilia and they get entangled in the mucus.

This then sticks to the inner lining of the nose. The cilia sometimes pushes these substances towards the nostril. This is then blown out by sneezing. Thus the harmful substances are prevented from entering the lungs

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