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What does each part of the"bunch of grabes"represent in relation to the breathing system

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Rodriguezmina94viz
The main stem represents the trachea, the smaller stems represents the bronchi, the smallest stems represents the bronchioles,the grapes represents the alveoli and the bunch of grapes represents the lungs.
main stem = trachea                                                                                                   the large branching stems = bronchi                                                                             the little stems = bronchioles                                                                                       the individual grapes = alveoli