State the volume of air remaining in the lungs after a normal breathing.

Question

Sourav Pan · Answer

The volume of air remaining in the lungs after a normal, passive exhalation is called the functional residual capacity (FRC)


 	
FRC comprises the expiratory reserve volume (ERV) plus the residual volume (RV)



 	
In healthy adults, FRC typically measures approximately 1800–2500 mL, with a commonly cited average value of around 2400 mL


 	
Some sources specify a standard value near 2300 mL



 	
This remaining air:


 	
Prevents alveolar collapse

 	
Maintains relatively stable gas composition in alveoli between breaths



 	
Therefore, after a normal tidal exhalation, the lungs still retain roughly 2.3–2.5 L of air at rest.

State the volume of air remaining in the lungs after a normal breathing.

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State the volume of air remaining in the lungs after a normal breathing.

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