what is exhalation or expiration?
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exhalation and expiration means the same and the meaning is breath out
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Exhalation (or expiration) is the flow of the breath out of an organism. In humans 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.
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