It isnt. There is no gas exchange in the trachea this takes place at the alveoli.
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Trachea, brochi, alveoli,lungs
The bronchoile branch from the trachea and they are the way by which air flowing through the trachea enters the lungs. The bronchoile split into smaller branches in the lungs and contain small sacs with attached capalliaries at the end called alveoli, where gas exchange occurs.
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The actual sites of gas exchange within the lungs are the alvioli.
The gas exchange that takes place in the lungs are carbon dioxide and oxygen.
bronchi (singular bronchus) --Allison
The efficiency of gas exchange in the lungs of vertebrates is greater because it increases the lungs' internal surface area.
via their lungs
AlveoliThe aveoli are small sacks in the lungs. A membrane that lines these sacks allows oxygen to move to the blood and carbon dioxide to move from the blood.Alveoli are particular to the lungs of mammals. Different structures are involved in gas exchange in other vertebrates.Air travels down the trachea, through thr bronchioles towards the terminal end of the respiratory tract, the alveoli. It is In the pulmonary alveolus that gas exchange with the surrounding capillary beds occurs. It is worth noting that alveoli are solely mammalian structures, so resporatory gas exchange occurs differently in other vertebrates and invertebrates.alveoli
gaseous exchange
The gas exchange that takes place in the lungs are carbon dioxide and oxygen.
The actual air exchange takes place in the alveoli of the lungs