Smallest branches of bronchi. a) Trachea b) Larynx c) Alveoli d) Bronchioles
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Within the lungs, the bronchi branch into smaller bronchi and even smaller tubes called bronchioles (BRAHN-kee-olz). Bronchioles end in tiny air sacs called alveoli, where the exchange of oxygen and carbon dioxide actually takes place. Each person has hundreds of millions of alveoli in their lungs.
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Answer:
d) bronchioles..........
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