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The part of the human body that tightens and moves down to create lower air pressure in the lungs than in the outside [environment], allowing air to move into the lungs. This part then relaxes and moves back up, generating higher air pressure in the lungs than the outside [environment], forcing carbon dioxide out of the lungs. This part also separates the chest cavity (cardiovasuclar and respiratory) from the abdominal cavity ([digestive system]), which is why your chest expands as you breathe. Also that fancy part of an air horn that rapidly vibrates in response to air movement, generating that screeching sound.
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