Which structure of lungs is directly involved in $O_{2} / C O_{2}$ exchange between air and blood capillaries?

Bronchi

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Trachea

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Alveoli

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Secondary bronchi

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Solution

The correct option is B Alveoli
During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are present in close contact with the alveoli.
So, the correct answer is 'Alveoli'

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