Intermediate Alveoli Quiz

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This quiz contains 10 questions. Click below to begin.

Q1. Which feature of alveolar walls allows rapid gas diffusion?

  • Thin simple squamous epithelium
  • Thick muscular lining
  • Pseudostratified ciliated epithelium
  • Multiple cell layers

Q2. What is the role of alveolar macrophages?

  • Produce red blood cells
  • Facilitate oxygen transport
  • Remove debris and pathogens
  • Secrete surfactant

Q3. How is oxygen transported from alveoli to the blood?

  • Osmosis into plasma
  • Diffusion across alveolar-capillary membrane
  • Active transport by alveolar cells
  • Facilitated diffusion through protein channels

Q4. Why are type I pneumocytes highly suited for gas exchange?

  • They produce mucus
  • They actively pump gases
  • They are flat and thin
  • They are ciliated

Q5. Which component of surfactant is critical for reducing surface tension?

  • DPPC (dipalmitoylphosphatidylcholine)
  • Albumin
  • Hemoglobin
  • Keratin

Q6. What happens to surfactant levels in premature infants?

  • They block alveolar pores
  • They are excessively high
  • They cause pulmonary edema
  • They are often insufficient

Q7. What separates air in alveoli from red blood cells?

  • Respiratory membrane
  • Lamina propria
  • Bronchial wall
  • Serous membrane

Q8. How does carbon dioxide exit the blood into alveoli?

  • By diffusion through respiratory membrane
  • By osmosis
  • By exocytosis
  • By active transport

Q9. Which factor most directly drives oxygen diffusion into blood?

  • Oxygen partial pressure gradient
  • Surfactant concentration
  • Alveolar temperature
  • CO₂ partial pressure

Q10. Which disease damages alveolar walls, reducing gas exchange surface?

  • Bronchitis
  • Emphysema
  • Asthma
  • Tuberculosis
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