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*Nose - used to inhale air to the body.
*Throat or pharynx - passage through the necks to the stomach and lungs.
*Trachea - an empty tube serves as the passage way of air into the lungs.
*Bronchi - 2 branching that connect trachea to the lungs.
*Bronchioles - a subdivided hair like tube within the lungs that connect the alveoli.
*Alveoli or air sacs - the site where exchanging of gas occur.
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