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1. alveoli- end in air sacs

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2. bronchi- near the center of the chest.

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3. bronchioles- divide into the smallest branches.

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4. cellular respiration- when cells use oxygen and nutrients to produce energy, water, and carbon dioxide.

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5. cilia- tiny, hairlike structures.

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6. epiglottis- special leaflike piece of cartilage, closing the opening into the larynx during swallowing.

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7. expiration- when the diaphragm and intercostal muscles relax.

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8. external respiration- the exchange of oxygen and carbon dioxide between the lungs and the bloodstream.

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9. inspiration- process of breathing in air.

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10. larynx- voice box, lies between the pharynx and trachea.

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11. internal respiration- exchange of carbon dioxide and oxygen between the tissue cells and the bloodstream.

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12. lungs- division of the bronchi and alveoli.

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13. nasal cavities- divides the nose into 2 hollow spaces.

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14. nasal septum- wall of cartilage.

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15. nose- has two openings through which air enters.

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16. pharynx- or throat lies directly behind the nasal cavities.

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17. pleura- each lung is enclosed in a membrane or sac.

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18. respiration- process of inspiration and expiration.

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19. respiratory system- consists of the lungs and air passages.

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20. sinuses- cavities in the skull that surround the nasal area.

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21. trachea- tube extending from the larynx to the center of the chest.

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22. ventilation- process of breathing.