The Success Center Mithi

What kind of epithelium favors rapid diffusion across lung air sacs?

A) Stratified squamous epithelium

B) Thin simple squamous epithelium

C) Simple cuboidal epithelium

D) Pseudostratified ciliated epithelium

Answer: B

Explanation: A one-cell-thick flat layer limits diffusion distance. This helps oxygen and carbon dioxide cross alveolar walls.

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