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Biology - Respiratory system - More...
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| A | B |
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| gas that leaves the alveolus | carbon dioxide |
| lung | this structure and the respiratory airways constitute the two parts of the respiratory system |
| air | enters and leaves through the same opening |
| nasal cavity | cavity lined with hair |
| trachea | tube lined with cilia |
| functional unit of lungs | alveolus |
| contains the vocal cords | larynx |
| gas that enters the alveolus | oxygen |
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