Moderate

Surfactant is produced by

Correct answer: B. Type II alveolar cells

  • A. Type I alveolar cells
  • B. Type II alveolar cells
  • C. Goblet cells
  • D. Ciliated cells

Explanation

Type II pneumocytes (alveolar cells) produce surfactant, which reduces surface tension to prevent alveolar collapse.

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About Gaseous Exchange in Lungs

Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.

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