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Updated: May 4, 2025
The above are named: The tidal air; complemental air; supplemental air; residual air. The quantity that can be expelled by the most forcible expiration after the most forcible inspiration, that is, the air that can be moved, indicating the "vital capacity," is about 225-250 inches. The chest is enlarged by the muscles of inspiration, the principal of which is the diaphragm or midriff.
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