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Figure 18-1
Refer to the accompanying figure. The structure labeled as 2 is homologous with the structure labeled as:
Respiratory Bronchiole
The smallest air passages in the lungs where gas exchange occurs, connecting the terminal bronchioles to alveolar sacs.
Terminal Bronchiole
The terminal bronchiole is the smallest airway in the respiratory tract that conducts air and does not engage in gas exchange.
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