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The alveolar epithelium in the lungs is

1. nonciliated columnar
2. nonciliated squamous
3. ciliated columnar
4. ciliated squamous

Correct answer: nonciliated squamous

Solution

The alveoli are specialized for rapid gas exchange, so their lining must be extremely thin to minimize diffusion distance. Simple squamous epithelium fits this role, and it is nonciliated because moving mucus is not its function.

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