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Question

Vital capacity of lungs is

A
Inspiratory Reserve Volume(IRV) + Expiratory Reserve Volume(ERV) + Tidal Volume (TV) + Residual Volume (RV)
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B
IRV + ERV + TV
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C
IRV + ERV
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D
IRV + ERV - RV
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E
IRV + TV
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Solution

The correct option is B IRV + ERV + TV
Vital capacity is the maximum amount of air, which can be breathed out through forceful expiration after a forceful inspiration. It is sum total of tidal volume (TV), Inspiratory reserve volume (IRV) and expiratory reserve volume (ERV) or total lung capacity minus residual volume. The value is 4.1 to 4.6 litres.

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