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# Forced Vital Capacity (2 of 2) The image presents two graphs. **Graph 1** * **X-axis:** Time (seconds) * **Y-axis:** Volume (liters) * **Graph type:** Line graph * **Description:** The graph illustrates the relationship between the volume of air expelled and the time taken during a forced vital...

# Forced Vital Capacity (2 of 2) The image presents two graphs. **Graph 1** * **X-axis:** Time (seconds) * **Y-axis:** Volume (liters) * **Graph type:** Line graph * **Description:** The graph illustrates the relationship between the volume of air expelled and the time taken during a forced vital capacity (FVC) test. It shows how the volume increases over time as the lungs are forcefully emptied. **Graph 2** * **X-axis:** Volume (liters) * **Y-axis:** Flow (liters/second) * **Graph type:** Two overlapping line curves. One representing the flow during inspiration and the other the flow during expiration of air **Key elements in the graphs** * **FEV1:** Volume of air expelled in the first second. * **FEV0.5:** Volume of air expelled in the first 0.5 seconds * **FEF75%:** Forced expiratory flow at 75% of FVC * **FVC:** Forced vital capacity, the total volume of air that can be expelled from the lungs after a maximal inhalation. * **PEF:** Peak expiratory flow. * **IAS:** Inspiratory air flow * **Notes**: Additional labels (probably percentages) are present in the second graph for each measurement of FEV(x) and FEF(x), describing the ratio to the FVC measured; eg: FEV/FVC x 100 %