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Why are lung alveoli so suitable for gas exchange?

Answer and explanation

Correct answer: Their walls are thin and their total surface area is large.

The governing concept is efficient diffusion across a large, thin respiratory surface. Alveoli have very thin walls, are surrounded by a dense network of blood capillaries, and occur in millions, creating a large total surface area. These features shorten the diffusion distance and provide close contact between air and blood, so oxygen and carbon dioxide can exchange rapidly. Option A identifies the essential structural advantages; the other choices are unrelated.

Related tags

AlveoliLungsGas ExchangeDiffusionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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