First slide

Exchange of Gases

Question

The respiratory membrane through which exchange of oxygen and carbon dioxide takes place consists of

Easy

A

stratified squamous epithelium
B

one layer of simple squamous epithelium
C

two layers simple cuboidal epithelium
D

two layers simple squamous epithelium

Solution

The respiratory membrane is made up of three major layers
the thin simple squamous epithelium of alveoli
the basement substance (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries)
the endothelium of alveolar capillaries (simple squamous).

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