Each nasal cavity is subdivided into _ passageways in man.
Correct answer: C. 3
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
Option A is wrong because it is a fact. Each nasal cavity is not subdivided into 1 passageway. Option B is wrong because each nasal cavity is not sub-divided into 2 passageways. Option: C Each nasal cavity is subdivided into three passageways by the projections of bones from the wall of the internal nose. PTB XI Chap # 13 page # 267 The nasal cavity is divided into vestibule, respiratory and olfactory sections. (Fact) Option D is wrong because each nasal cavity is subdivided into 3 passageways instead of 4
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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