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After forceful inspiration, the amount of air that can be breathed out with maximum forced expiration is equal to
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IRV +TV + ERV
The maximum amount of air which can be breathed out through forceful expiration after a forceful inspiration is equal to the sum of tidal Volume (TV), Inspiratory Reserve Volume (IRV) and Expiratory Reserve Volume (ERV) and called as vital capacity. Its value is 4.1 - 4.6 litres.
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