exhalation
Sign in to saveAlso known as breathing out, expiration phase, exhalation phase, expiratory phase
thumb|Diagram showing expiration Exhalation (or expiration) 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 it has depressed to rise superiorly and put pressure on the lungs to expel the air. During forced exhalation, as when blowing out a candle, expiratory
Research
21,691 papers- Exposure, Retention, Exhalation, Symptoms, and Environmental Accumulation of Chemicals During JUUL Vaping.Chemical research in toxicology · 2023
- RADON INHALATION EXPERIMENTS TO TEST RADON EXHALATION KINETICS.Radiation protection dosimetry · 2020
- Exhalation metabolomics for noninvasive staging biomarker exploration in silicosis.Journal of breath research · 2025
- Exhaled biomarkers.Chest · 2006
- [Modern breath analysis].Medizinische Klinik, Intensivmedizin und Notfallmedizin · 2019
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Wikidata facts
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- NCI Thesaurus ID
- C50391
- Commons category
- Exhalation
Sources (3)
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Article
14 sectionsContents
- Physiology
- Composition
- Smell
- Spirometry
- Brain involvement
- Voluntary expiration
- Involuntary expiration
- Yawning
- Receptors
- Yoga
- See also
- References
- Further reading
- External links
thumb|Diagram showing expiration Exhalation (or expiration) 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 it has depressed to rise superiorly and put pressure on the lungs to expel the air. During forced exhalation, as when blowing out a candle, expiratory muscles including the abdominal muscles and internal intercostal muscles generate abdominal and thoracic pressure, which forces air out of the lungs.
Exhaled air is 4% carbon dioxide, a waste product of cellular respiration during the production of energy, which is stored as ATP. Exhalation has a complementary relationship to inhalation which together make up the respiratory cycle of a breath.