Simplify the expression. 
Definitions:
Tidal Volume
Tidal volume is the amount of air that is inhaled or exhaled during a normal breath at rest.
Inspiratory Reserve Volume
The maximum amount of air that can be inhaled after a normal inhalation, measuring lung capacity beyond a typical breath.
Respiratory Volume Measurements
Quantitative assessments of different volumes and capacities in the lungs during breathing and respiratory activity.
Total Lung Capacity
The maximum amount of air the lungs can hold, typically measured after a maximal inhalation effort.
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