The lungs' pleural fluid makes the lung walls adhere to the thoracic wall. The diaphragm flattens and tightens during inspiration , and the chest cavity widens.
A vacuum is produced by the contraction, drawing air into the lungs. The diaphragm relaxes and assumes its dome-like form during exhalation, forcing air from the lungs. Your diaphragm contracts and descends when you inspiration, or breathe in. Your lungs expand into the additional space in your chest cavity as a result. The muscles in the area between your ribs also aid in chest cavity expansion. As a result of the diaphragm and intercostal muscles contracting during inhaling, the lung volume increases.
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