The total volume of air accommodated in the lungs at the end of forced inspiration is known as Total Capacity(TLC). TLC is equal to
(where, TV= Tidal volume, IRV= Inspiratory reserve volume, ERV= Expiratory reserve volume, RV= Residual volume)

TLC= ERV+ IRV+TV

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TLC= TV+RV+ERV

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TLC= ERV+RV

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TLC= ERV+IRV+TV+RV

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Solution

The correct option is B TLC= ERV+IRV+TV+RV
The total volume of air accommodated in the lungs at the end of forced inspiration is known as Total Capacity(TLC). It is equal to vital capacity and residual volume. Vital capacity is total exchangeable air in the system. It is calculated by adding tidal volume, inspiratory reserve volume, and expiratory reserve volume. Hence, TLC is the sum of Expiratory Reserve Volume (ERV), Inspiratory reserve volume (IRV), Tidal volume (TV) and Residual volume (RV).
Thus, the correct answer is option D.

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E R V + R V

T R V + E R V

T V + I R V + E R V + R V

V C + R V

I	Inspiratory Capacity (IC)
II	Functional Residual Capacity (FRC)
III	Vital Capacity (VC)
IV	Inspiratory Reserve Volume (IRV)
V	Residual Volume RV)
VI	Expiratory Reserve Volume (ERV)
VII	Tidal Volume (TV)

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