Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

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Solution

When air is taken in and let out during breathing, the lungs always contain a residual volume of air, this prevents the lungs from collapsing.

Also, the residual volume ensures that there is sufficient time ‘for the oxygen to be absorbed into the blood and ‘for the carbon dioxide to be released out from the blood’.

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