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Why are alveoli effective for exchange of gases?

Answer and explanation

Correct answer: They have thin walls and a large surface area

The governing concept is adaptation for efficient diffusion. Alveoli are numerous tiny air sacs with very thin, moist walls, creating a large surface area. A dense network of blood capillaries surrounds them, maintaining a concentration gradient so oxygen diffuses into blood and carbon dioxide diffuses into the alveolar air. Thus option A is correct. Digestion, urine formation and bile production occur in other organs.

Related tags

AlveoliGas ExchangeLungsDiffusionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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