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?
- Collagen type IV
- Albumin
- Elastin
- Surfactant protein B
Q3. What is the approximate thickness of the alveolar-capillary membrane?
- 5–10 micrometers
- 2–3 millimeters
- 0.2–0.6 micrometers
- 1 centimeter
Q4. Which molecule in surfactant lowers surface tension most effectively?
- Dipalmitoylphosphatidylcholine (DPPC)
- Hemoglobin
- Keratin
- Sodium chloride
Q5. What is the partial pressure of oxygen in alveolar air under normal conditions?
- Approximately 104 mmHg
- 140 mmHg
- 200 mmHg
- 60 mmHg
Q6. How do type II pneumocytes regenerate the alveolar lining?
- They differentiate into type I cells
- They transport red blood cells
- They phagocytose surfactant
- They become alveolar macrophages
Q7. Which factor most significantly impairs gas diffusion in pulmonary fibrosis?
- Increased airway resistance
- Bronchial obstruction
- Thickened alveolar-capillary barrier
- Decreased surfactant volume
Q8. How does high altitude affect alveolar gas exchange?
- Blocks carbon dioxide release
- Raises alveolar humidity
- Increases air density
- Decreases oxygen gradient
Q9. Which law describes the inverse relationship between gas volume and pressure affecting alveolar ventilation?
- Dalton’s law
- Fick’s law
- Boyle’s law
- Henry’s law
Q10. Why is alveolar ventilation more efficient in the lower lungs?
- Presence of more lymphatics
- Higher oxygen concentration at apex
- Better perfusion and ventilation at base
- Greater bronchial diameter