Layers through which gases must diffuse in external respiration include those listed below.What is the correct sequence of these layers for oxygen diffusion in external respiration?
1)basement membrane of capillary epithelium
2)epithelium of alveolar wall
3)interstitial space
4)thin layer of fluid lining the alveolus
5)basement membrane of alveolar epithelium
6)epithelium of capillary wall
A) 2, 5, 4, 3, 1, 6
B) 5, 2, 4, 3, 6, 1
C) 6, 1, 3, 5, 2, 1
D) 4, 2, 5, 3, 1, 6
E) 6, 1, 3, 4, 2, 5

Question

Quizplus · Accepted Answer

The correct sequence for oxygen diffusion in external respiration starts with the thin layer of fluid lining the alveolus, then moves through the epithelium of the alveolar wall, the basement membrane of the alveolar epithelium, the interstitial space, the basement membrane of the capillary epithelium, and finally the epithelium of the capillary wall.

Layers Through Which Gases Must Diffuse in External Respiration Include