Question

why lungs contain residual volume

Answer 1

The lungs contains residual volume because :-

1) It prevents lungs from collapsing each other after a each breath.
2) And it also keeps lungs ventilated between consecutive breath.

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Answer 2

$\huge\mathfrak\red{Heya\:Mate}$

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During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbondioxide to be released.

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