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?
- Pseudostratified ciliated epithelium
- Thick muscular lining
- Multiple cell layers
- Thin simple squamous epithelium
Q2. What is the role of alveolar macrophages?
- Produce red blood cells
- Remove debris and pathogens
- Facilitate oxygen transport
- Secrete surfactant
Q3. How is oxygen transported from alveoli to the blood?
- Osmosis into plasma
- Active transport by alveolar cells
- Diffusion across alveolar-capillary membrane
- 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 ciliated
- They are flat and thin
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 are excessively high
- They are often insufficient
- They block alveolar pores
- They cause pulmonary edema
Q7. What separates air in alveoli from red blood cells?
- Respiratory membrane
- Bronchial wall
- Serous membrane
- Lamina propria
Q8. How does carbon dioxide exit the blood into alveoli?
- By diffusion through respiratory membrane
- By exocytosis
- By active transport
- By osmosis
Q9. Which factor most directly drives oxygen diffusion into blood?
- Surfactant concentration
- CO₂ partial pressure
- Alveolar temperature
- Oxygen partial pressure gradient
Q10. Which disease damages alveolar walls, reducing gas exchange surface?
- Tuberculosis
- Asthma
- Bronchitis
- Emphysema