Which structure of the lungs is directly invo | vedclass

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(C) The primary bronchus of the lungs divides to form secondary bronchi,which further divide to form tertiary bronchi. The tertiary bronchi subdivide

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Alveoli

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(C) The primary bronchus of the lungs divides to form secondary bronchi,which further divide to form tertiary bronchi. The tertiary bronchi subdivide into bronchioles. The bronchioles open into the alveoli through alveolar ducts,atria,and alveolar sacs. The alveoli have very thin walls consisting of squamous epithelium. The wall of the alveoli has an extensive network of blood capillaries. Due to the very intimate contact of blood capillaries with the alveoli,the exchange of gases takes place easily.

Which structure of the lungs is directly involved in $O_2 / CO_2$ exchange between air and blood capillary?

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