Figure 4 - Lung volumes.

IRV, inspiratory reserve volume; TV, tidal volume; ERV, expiratory reserve volume; RV, residual volume; IC, inspiratory capacity; FRC, functional residual capacity; TLC, total lung capacity; VC, vital capacity; Obstr., obstructive lung diseases (e.g., asthma, chronic obstructive lung disease); Insp. Restr., inspiratory restrictive lung disease (e.g., pulmonary fibrosis, pleural fibrosis or effusion, diaphragmatic weakness); Expir. Restr., expiratory restrictive lung disease (e.g., ascites, obesity, pregnancy, weakness of abdominal musculature).