E.G Mammalian Lung
Breath in - air enters the Trachea
Trachea splits in to 2 Bronchi - 1 Bronchus for each lung
Bronchus branch out into Bronchioles (smaller tubes)
Bronchioles end in small sacs - Alveoli (gas exchange happens here)
Intercostal muscles, ribcage and diaphragm work together to move air in and out
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