How emphysema increase the residual volume of lung
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✔Normally, FRC in normal LUNGS occurs at the LUNG volume where equilibrium between recoil pressures of the chest wall and lungs is ACHIEVED with therespiratory muscles at rest (long-dashed lines).
✔ This is also called the resting volume. Loss of lung elasticity due to EMPHYSEMA in COPD reduces the lung recoil pressure.