The volume of air present in the lungs after forceful expiration is called as

Tidal volume

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Residual air

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Complementary air

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None of the above

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Solution

The correct option is B Residual air
Residual volume is the volume of air remaining in the lungs after a maximal exhalation. A certain volume of air remains within the lungs, maintaining the alveoli expanded and the airways patent. Residual volume is about 1.2 litres.

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