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Inhaled air contains more oxygen than carbon dioxide and other gases. Exhaled air contains mostly carbon dioxide as the inhaled oxygen was used up to create energy. Waste carbon dioxide (and other unwanted gases) is then let out of the body and the cycle continues. :)

Gas exchange

Gas% in inhaled air% in exhaled airOxygen2116Carbon dioxide0.044Nitrogen7979

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11y ago
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Q: How does concentration of inhaled and exhaled air differ?
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