Question

Choose the most appropriate combination of components of respiratory membrane, from the following.

• A. Alveolar wall and ducts
• B. Inner and outer pleural membranes and pleural fluid
• C. Membranes of alveolar ducts and capillaries
• D. Alveolar wall, alveolar capillary and interstitial space

Answer 1

Answer: (D)

The wall of alveoli is very thin and has rich network of blood capillaries. It seems to be a sheet of flowing blood and is called respiratory membrane. The respiratory membrane consists of alveolar epithelium, epithelial basement membrane, a thin interstitial space, capillary basement membrane and capillary endothelium.