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what does each part of the bunch of grapes model represents, in relation to the brearhing system

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Dominiid
The relation of grapes model to the breathing system;

The mainstem represents as the trachea.
The main branching stem represents as the bronchi.
The branches represents as the bronchioles; and
The circles (the grapes) represents as the airsacs of the lungs or alveoli.

Hope it Helps =)
-----Domini-----