Question

State the respective lowest and highest value of respiratory volumes.

• A. TV, VC
• B. ERV, IC
• C. TV, TLC
• D. RV, VC

Answer 1

Answer: (C)

TV, TLC

The tidal volume (TV) is the amount of air inhaled during normal and relaxed breathing. The normal value is about 500 mL. Vital capacity (VC) is the maximum amount of air that can be exhaled out after a maximum inhalation. It is sum of inspiratory reserve volume (IRV), tidal volume (TV), and expiratory reserve volume (ERV). Residual volume (RV) is the amount of air left in the lungs after a forceful exhalation. The normal value is about 1200 mL. ERV is the additional air that can be exhaled out after exhalation of tidal volume. The normal value is about 1100 mL. Inspiratory capacity (IC) is the total volume of air that can be inhaled. The normal value is about 3600 mL. Total lung capacity (TLC) is the sum of IRV, TV, and RV. It is the total volume of air filled in the lungs after a forced inhalation. It is about 6000 mL.

Thus, the correct answer is 'TV, TLC.'