Explain the role of the diaphragm and intercostal muscles in inhalation and exhalation.
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Respiratory muscles
The diaphragm is attached to the base of the sternum, the lower parts of the rib cage, and the spine. As the diaphragm contracts, it increases the length and diameter of the chest cavity and thus expands the lungs. The intercostal muscles help move the rib cage and thus assist in breathing.
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