After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to

IRV + ERV + TV + RV

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IRV + RV + ERV

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IRV + TV + ERV

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TV + RV + ERV

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Solution

The correct option is D IRV + TV + ERV
Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume and expiratory reserve volume. In a healthy young adult, IRV measures about 3 L and the ERV is approximately 1.1 litre TV is about 500 ml in an averagely built (70 kg), healthy, young adult. Hence, VC is about 4 to 4.6 litres.

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Column I	Column II
A. TV + ERV	(i) Expiratory capacity
B. RV + ERV + TV + IRV	(ii) Total lung capacity
C. ERV + RV	(iii) Functional residual capacity

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