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What is the main advantage of blood capillaries around alveoli?

Answer and explanation

Correct answer: To quickly carry gases to and from the blood

The governing concept is efficient gaseous exchange in the lungs. Alveoli have very thin walls and are surrounded by a dense network of capillaries. Oxygen diffuses from the alveolar air into the blood, while carbon dioxide diffuses from the blood into the alveoli to be exhaled. Their close contact shortens the diffusion distance, so option A is correct. The other options describe functions of digestion or excretion, not alveolar capillaries.

Related tags

AlveoliCapillariesGas ExchangeLife ProcessesWorld Of LivingScienceClass 10 Mcq

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