The diffusion membrane of the lungs,through which the exchange of gases occurs,is made up of which of the following layers?
- AOnly alveolar epithelium
- BAlveolar epithelium and capillary endothelium
- CAlveolar epithelium,capillary endothelium,and tunica adventitia
- DAlveolar epithelium,capillary endothelium,tunica media,and a thin layer of tunica adventitia
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The diffusion membrane is made up of:
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$(1)$ Atmospheric air enters: Inspiration :: Alveolar air released out: ..........
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