Advanced Alveoli Quiz

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This quiz contains 10 questions. Click below to begin.

Q1. What is the function of pores of Kohn in alveoli?

  • Allow collateral ventilation
  • Anchor alveolar macrophages
  • Transport surfactant
  • Carry blood between alveoli

Q2. Which protein stabilizes surfactant in alveolar fluid?

  • Elastin
  • Albumin
  • Surfactant protein B
  • Collagen type IV

Q3. What is the approximate thickness of the alveolar-capillary membrane?

  • 2–3 millimeters
  • 0.2–0.6 micrometers
  • 5–10 micrometers
  • 1 centimeter

Q4. Which molecule in surfactant lowers surface tension most effectively?

  • Keratin
  • Hemoglobin
  • Dipalmitoylphosphatidylcholine (DPPC)
  • Sodium chloride

Q5. What is the partial pressure of oxygen in alveolar air under normal conditions?

  • 200 mmHg
  • 60 mmHg
  • Approximately 104 mmHg
  • 140 mmHg

Q6. How do type II pneumocytes regenerate the alveolar lining?

  • They transport red blood cells
  • They differentiate into type I cells
  • They become alveolar macrophages
  • They phagocytose surfactant

Q7. Which factor most significantly impairs gas diffusion in pulmonary fibrosis?

  • Thickened alveolar-capillary barrier
  • Bronchial obstruction
  • Increased airway resistance
  • Decreased surfactant volume

Q8. How does high altitude affect alveolar gas exchange?

  • Raises alveolar humidity
  • Increases air density
  • Blocks carbon dioxide release
  • Decreases oxygen gradient

Q9. Which law describes the inverse relationship between gas volume and pressure affecting alveolar ventilation?

  • Dalton’s law
  • Henry’s law
  • Fick’s law
  • Boyle’s law

Q10. Why is alveolar ventilation more efficient in the lower lungs?

  • Higher oxygen concentration at apex
  • Better perfusion and ventilation at base
  • Presence of more lymphatics
  • Greater bronchial diameter
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