NEETZoologyBreathing and Exchange of Gases
Select the option that correctly states the physiological description and the mathematical expression for Functional Residual Capacity (FRC).
Options
- AVolume of air remaining in the lungs after a forced expiration; RV
- BTotal volume of air a person can expire after a normal inspiration; TV + ERV
- CVolume of air remaining in the lungs after a normal expiration; TV + RV
- DVolume of air that will remain in the lungs after a normal expiration; ERV + RV
Correct answer
D. Volume of air that will remain in the lungs after a normal expiration; ERV + RV
Step-by-step solution
Functional Residual Capacity (FRC) is defined as the volume of air that will remain in the lungs after a normal expiration. It is mathematically expressed as the sum of Expiratory Reserve Volume (ERV) and Residual Volume (RV). Option 1 describes Residual Volume (RV). Option 2 describes Expiratory Capacity (EC). Option 3 provides an incorrect mathematical formula for FRC. Answer: Volume of air that will remain in the lungs after a normal expiration; ERV + RV