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The internal pressure of the lungs is controlled by the diaphragm and the muscles of the thorax (chest). Inhalation is caused by increasing the volume (which lowers the internal pressure) while decreasing the volume (increases the internal pressure) leads to exhalation, similar to the way a bellows works. The elastic qualities of the lung also help the process of exhalation.

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Q: In the lungs what do you need to increase the internal pressure?
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