Why is the inspiratory reserve volume (IRV) greater than the expiratory reserve volume (ERV)?
What will be an ideal response?
The IRV is larger than the ERV by about 1000-1200 mL of air. IRV refers to the volume of air that can be forcibly inspired after a normal tidal inspiration. After a forceful expiration using accessory muscles that can only expel a certain amount of air, is known as the expiratory reserve volume. The ERV is limited because, some air remains in the lungs as a volume known as the residual volume (RV). The RV is due mostly to the intrapleural pressure and outward recoil of the chest wall, which keeps the lungs slightly inflated and limits the amount of air that can be expelled. Therefore the IRV is larger than the ERV.
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