alleryStart learning →Which two membranes together form the respiratory membrane?
AThe visceral and parietal pleural layers
BThe mucosa and the fibroelastic membrane
CThe alveolar wall and the capillary wall
DThe basement membrane and the pleura
Answer & Solution
Correct answer: C. The alveolar wall and the capillary wall
1. The alveolar epithelium is extremely thin and borders the endothelial membrane of the capillaries.
2. Taken together, the alveolar and capillary membranes form the respiratory membrane.
3. That membrane allows gases to cross by simple diffusion, so the third option is correct.
4. The visceral and parietal pleurae wrap the whole lung and are not the gas exchange barrier.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.1 Organs and Structures of the Respiratory System_
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