Volume of air remaining at end of maximal expiration is :
Residual volume (RV)
Residual volume (RV) is the air that remains in the lungs after a maximal expiration, about 1.0–1.2 litres in adults; it keeps alveoli from collapsing and cannot be breathed out voluntarily.
Expiratory reserve volume is the extra air that can be forcefully exhaled after a normal expiration; inspiratory reserve volume is the extra air inhaled after a normal inspiration; tidal volume is the air moved in a normal breath (about 500 mL).
Hence, the volume of air remaining at the end of maximal expiration is the Residual volume (RV).
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