Answer / biomaster

1) Type I pneumocyte

2) tight junction

3) endothelial cell.

Answer / joe clemons

Blood Air Barrier form capillary out (CO2)

1) endothelial cell
2) basement membrane of endothelial cell
3) variable amount of connective tissue
4) basement membrane on the type I pneumocyte (composed of
squamous epithelium)
5) cytoplasm of type I pneumocyte
6) surfactant layer

Reverse order for path of O2

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