Question

How much amount of volume of air is in lungs as FRC?

• A. 1500 ml to 1600 ml
• B. 2100 ml to 2500 ml
• C. 2500 ml to 3000 ml
• D. 1600 ml to 2100 ml

Answer 1

Answer: (B)

2100 ml to 2500 ml

Functional residual capacity (FRC) is the amount of air that remains in the lungs after a normal expiration. At FRC, there is no exertion by the diaphragm or respiratory muscles. FRC is the total of Expiratory Reserve Volume (ERV) and Residual Volume (RV). ERV is 1.1 litres and RV is 1.2 litres. In an average-sized individual, 2100 ml to 2500 ml of volume of air is present in lungs FRC.

Thus, the correct answer is option B.