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Nostrils, trachea, Bronchi, Lungs, Alveolus, Diaphram. 
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Nose-where air undergoes purification, warming and moistening.

trachea- also known as windpipe which gives off branches which are the bronchii and bronchioles .

lungs - where oxygen is taken by the red blood cells

diaphragm and intercostal muscles - these 2 muscles helps to allow  movements of ribcage during inhalation and exhalation

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