Given below are the layers of the respiratory membrane. In what order would oxygen pass through this membrane under normal circumstances?
1) layer of fluid lining the alveolus
2) alveolar epithelium
3) alveolar epithelium basement membrane
4) interstitial space
5) capillary endothelium's basement membrane 6) capillary endothelium
A. 6,5,4,3,2,1
B. 4,1,2,3,5,6
C. 1,3,2,5,6,4
D. 1,2,3,4,5,6
E. 2,1,4,3,6,5
Ans: D. 1,2,3,4,5,6
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