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The big stem represent the TRACHEA.the two branch of connecting stem represent the BRONCHI.the small stem represent the BRONCHIOLES.the fruit represent the ALVEOLI.
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The straw outside the model :trachea 
the straw inside the model:bronchi
the bottle:chest cavity/rib cage 
the two small balloons:lungs
the bottom at the model is the :diaphragm
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