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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.
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उत्तर
To maintain gas exchange efficiency. The lungs leftover air volume provides continuous oxygen to the blood, preventing alveolar collapse between breaths. This maintains oxygen levels and promotes gas diffusion.
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