NEETZoologyBreathing and Exchange of Gases
If a physician calculates the mathematical difference between a person's Total Lung Capacity (TLC) and Vital Capacity (VC), the resulting value represents a specific respiratory volume. Which of the following correctly identifies this volume and its key physiological characteristic?
Options
- AFunctional Residual Capacity; it is the volume of air that remains in the lungs after a normal expiration.
- BResidual Volume; it is the volume of air remaining in the lungs even after a forcible expiration.
- CResidual Volume; it is the volume of air that remains in the lungs after a normal expiration.
- DExpiratory Reserve Volume; it is the additional volume of air a person can expire by a forcible expiration.
Correct answer
B. Residual Volume; it is the volume of air remaining in the lungs even after a forcible expiration.
Step-by-step solution
Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. It is the sum of RV, ERV, TV, and IRV. Vital Capacity (VC) is the maximum volume of air a person can breathe in after a forced expiration, which includes ERV, TV, and IRV. Therefore, the mathematical difference is: TLC - VC = RV (Residual Volume). Residual Volume is defined as the volume of air remaining in the lungs even after a forcible expiration. It averages 1100 mL to 1200 mL and cannot be measure