Q1. Name different volumes & capacities in the given figure and give their normal values.
Q2. Which of these cannot be measured by ordinary spirometer? What technique is used to measure them?
A1.
Click on the image to enlarge
- Tidal Volume (TV) - 500 ml
- Inspiratory Reserve Volume (IRV): 2000 to 3200 ml
- Expiratory Reserve Volume (ERV): 750 to 1000 ml
- Residual Volume (RV): 1200 ml
- Inspiratory capacity =IRV + TV: 2500 to 3700 ml
- Vital capacity – IRV + TV + ERV: 4 to 5L
- Functional Residual Capacity: ERV+RV = 2300 to 2500 ml
- Total Lung capacity: 6L
A2.
- Residual volume, Functional Residual capacity & Total lung capacity cannot be measured by using Spirometer.
- Nitrogen wash out method & Helium dilution techniques