Which of these parts of the respiratory system are involved in defense?

Nasal hair

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Ciliary cells

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Nasal bone

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Mucus

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Solution

The correct options are
A Nasal hair
B Ciliary cells
D Mucus
Small hair in the nose prevent dust and germs from entering the lungs.
Lysozyme present in the mucus destroys germs.
Ciliary cells transport mucus containing dust and germs to the
pharynx and then to the digestive tract.
Finally, the unwanted substances are eliminated out of the body.

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