Structure and Function of Nose and Nasopharynx

Question 1

Functions of nose and sinuses

Answer 1

• Warms and humidifies the air we breathe in
• Collects moisture from expired air to prevent excessive water loss
• Stiff hairs that grow at the vestibule filter large, harmful particles
• Smaller particles are deposited on the lining of the nose
• Epithelial lining of the nose is ciliated and mucociliary pathway clears nasal debris
• House the olfactory receptors and olfactory epithelium

Sinuses are out-pouching of nose
Most sinuses drain into middle meatus
Eustachian tubes open into the postnasal space