What respiratory capacity represents the maximum volume of air a person can breathe in after a forced expiration (Tidal Volume + Inspiratory Reserve Volume + Expiratory Reserve Volume)?

Answer and explanation

Correct answer: A. Vital Capacity (VC)

  1. Step 1: Standard spirometric evaluations define lung capacities as combinations of specific primary respiratory volumes.
  2. Step 2: Vital Capacity (VC) is the maximal volume of air that can be inhaled following a maximal forced expiration (or exhaled following maximal inspiration).
  3. Step 3: Summing the components yields , measuring approximately in a healthy young adult.
Answer
Vital Capacity (VC).
Why not the others: Total Lung Capacity (TLC) represents the total air volume in the lungs following maximal inhalation (), including residual volume that cannot be exhaled; Functional Residual Capacity (FRC) is the volume of gas remaining in lungs after a normal passive expiration (); Inspiratory Capacity (IC) is the maximum volume that can be inhaled from normal end-expiratory level ().

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