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MBBS QUESTION #10152
Question 1
The alveolar wall of the lung is lined by simple squamous epithelium (type I pneumocytes). This epithelial type is functionally best suited for:
  • Secretion of mucus
  • Active absorption of nutrients
  • Rapid passive gas diffusion✔️
  • Mechanical protection against abrasion
Correct Answer Explanation
Simple squamous epithelium consists of a single layer of extremely thin, flattened cells, minimizing diffusion distance — ideal for rapid passive gas exchange across the alveolar-capillary membrane.