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- Dictionaryexhalation/ˌɛks(h)əˈleɪʃn/
noun
- 1. the process or action of exhaling: "the gas produced at the end of exhalation from deep within the lung"
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noun
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Exhalation is the flow of the breath out of an organism. In animals, it is the movement of air from the lungs out of the airways, to the external environment during breathing. This happens due to elastic properties of the lungs, as well as the internal intercostal muscles which lower the rib cage and decrease thoracic volume. As the thoracic diaphragm relaxes during exhalation it causes the tissue... Wikipedia