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| The exchange of oxygen and carbon dioxide in cells |
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| Tiny hairs in the nose and respiratory tract |
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| Nerves that detect odors and smells |
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| The windpipe - connects lungs to nasal passages |
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| Safety valve that keeps food out of the esophagus |
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| The two main organs of the respiratory system |
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| Membrane that surrounds the lungs |
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| Tiny branching tubes in the lungs |
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| Large, flat muscle that controls breathing |
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| Stretchy bands of tissue that produce sound |
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| Gas needed by all body cells |
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| Gas released by the lungs |
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| Action that forces dust and bacteria out of nose |
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