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प्रश्न
Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.
Give reason for the following:
Lungs always contain a residual volume of air.
स्पष्ट करा
कारण सांगा
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उत्तर
During the normal breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air, allowing sufficient time for oxygen to be absorbed and carbon dioxide to be released.
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