Which structure of the lungs is directly involved in $\frac{O_{2}}{C O_{2}}$ exchange between air and blood capillary?

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 C Alveoli
Alveoli of lungs are directly involved in the exchange of $\frac{O_{2}}{C O_{2}}$ between air and blood capillary.
Primary bronchus of lungs divides to from secondary bronchi which further divides to form tertiary bronchi. The tertiary bronchi are sub-divided into bronchioles. The bronchioles open to alveoli through the alveolar duct, atria and alveolar sacs. The alveoli have a very thin wall consisting of squamous epithelium. The wall of alveoli has an extensive network of blood capillaries. Due to very intimate (one cell thick wall to wall ) contact of blood capillaries with the alveoli, the exchange of gases takes place easily.

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O_{2} / C O_{2}

\frac{O_{2}}{C O_{2}}

C O_{2}

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Respiration in insects is called direct because

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C O_{2}

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