NEETZoologyBreathing and Exchange of Gases
Identify the correct name and the standard average value of the volume of air that will remain in the lungs after a normal expiration in a healthy human.
Options
- AFunctional Residual Capacity; 2100 - 2300 mL
- BResidual Volume; 1100 - 1200 mL
- CExpiratory Capacity; 1500 - 1600 mL
- DFunctional Residual Capacity; 3600 - 4200 mL
Correct answer
A. Functional Residual Capacity; 2100 - 2300 mL
Step-by-step solution
The volume of air that remains in the lungs after a normal expiration is called the Functional Residual Capacity (FRC). It includes the Expiratory Reserve Volume (ERV) and the Residual Volume (RV). FRC = ERV + RV According to standard physiological values in a healthy human: ERV = 1000 - 1100 mL RV = 1100 - 1200 mL Therefore, FRC = (1000 + 1100) to (1100 + 1200) mL = 2100 - 2300 mL. Residual Volume ( 1100 - 1200 mL) is the air remaining after a forcible expiration. Expiratory Capacity ( 1500 - 1600 mL) is the total