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When you breathe in the air particles will go to your nose and then to nasal passages next on the trachea or the empty tube then go to the bronchitis where it connects the trachea and the lungs then the bronchi as a hair like tube then the last is the alveoli or the air sacs

:) TaengPark
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From the nose and mouth, oxygen travels to the trachea, bronchi, bronchioles and then to the alveoli
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