Q:

What constitutes the respiratory membrane?

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What constitutes the respiratory membrane?


  1. the parietal and visceral pleurae and enclosed pleural fl uid
  2. capillary and alveolar epithelial cells, their basement membranes and adjacent fl uid
  3. the alveolar surface fl uid and epithelial cells
  4. alveolar epithelial and septal cells, ciliated cells, macrophages and surfactant.

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B: The cells lining the alveoli and the capillaries and their fused basement membrane, along with the fl uid (surfactant) lining the alveoli together are the membrane. Pleurae, ciliated cells and macrophages are not.

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