Answer:
(a)
Nasal Hairs These are fine hairs present in the lining of the nasal passage.
These hair helps in filtering the air passing through it so that germ free air
could reach the lungs. (1)
(b) Diaphragm It is a muscular partition between the thoracic and
abdominal region in our body.
Movement of diaphragm helps in the breathing process.
(1)
(c) Alveoli These are balloon-like structures, which increase
the surface area for the gaseous exchange to takes place in the lungs.
(1)
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