NCERT Based General Studies (GS): Questions 1 of 4883

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Question MCQ▾

In human respiratory system air is warmed and moistened in:

Choices

Choice (4)Response

a.

Nostrils

b.

Nasal cavity

c.

Pharynx

d.

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Answer

b.

Explanation

In nasal cavity air is warmed and moistened. Nasal cavity ends in internal nostrils through which air enters into pharynx. Nostrils are the nasal opening through which air is drawn into nasal cavity. The nasal cavity is separated from oral cavity by a bony plate.

Nasal cavity has central septum which divides it into paired nasal passages. The nasal passages are lined by ciliated epithelium and mucus secreting cells. Both mucus and cilia check the entry of dust particles and microbes. Pharynx is a common passage for air and food.

The Human Nasal Cavity