How the Lungs Work What Breathing Does for the Body
https://www.nhlbi.nih.gov/health/lungs/breathing-benefits
WebMar 24, 2022 · Breathing involves two phases: breathing in and breathing out. If you have problems breathing, gas exchange may be impaired, which can be a serious health problem. Breathing in. When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it.
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