What are the layers encountered by O_2 as it | vedclass

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(D) The diffusion membrane is composed of three major layers: $1$. The thin squamous epithelium of the alveoli. $2$. The endothelium of the alveolar c

Vedclass · Accepted Answer

Epithelium of alveoli $\rightarrow$ Basement membrane $\rightarrow$ Endothelium of capillaries

Vedclass · Answer

(D) The diffusion membrane is composed of three major layers: $1$. The thin squamous epithelium of the alveoli. $2$. The endothelium of the alveolar capillaries. $3$. The basement substance (basement membrane) in between them. As $O_2$ moves from the alveoli into the blood,it first crosses the alveolar epithelium,then the basement membrane,and finally the capillary endothelium. Therefore,the correct sequence is: Epithelium of alveoli $\rightarrow$ Basement membrane $\rightarrow$ Endothelium of capillaries.

Column-$I$	Column-$II$
$A$. Alveoli	$i$. $0.3 \ mmHg \ PCO_2$
$B$. Deoxygenated blood	$ii$. $45 \ mmHg \ PCO_2$
$C$. Atmospheric air	$iii$. $104 \ mmHg \ PO_2$
$D$. Tissue	$iv$. $40 \ mmHg \ PO_2$

What are the layers encountered by $O_2$ as it passes through the diffusion membrane from the start to the end?

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