Give reason: why lungs contain residual volume of air
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Explanation:
The lungs have residual volume of air because during breathing cycle there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released. It prevents lungs do not collapse.
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Answer:
Residual volume of air is the amount of air (gas) that remains in lungs after maximal exhalation. This volume of air helps to prevent lungs from collapsing
Even after we have expelled as much air as possible (expiratory reserve volume) gaseous exchange is still occurring by residual volume in the lungs.
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