Why is determination of lung volume and capacity important?

Expert Answers
megamind-616 eNotes educator| Certified Educator

Lung volume and lung capacity are two measurements of respiratory health and measured during pulmonary functions tests. 

Lung volumes are parts of lung compartments into which the lungs are divided. Lung volumes are a series of measurements that are a part of pulmonary functions test. It measures the volumes of air that move in and out of the normal breathing cycle, as well as with additional effort. Spirometry measures lunch volumes. Spirometry involves a patient breathing through a closed circuit cylinder that is inverted over water. 

Lung capacities are two or more lung volumes. For example, the total volume of a maximum inhale is the sum of tidal volume plus inspiratory reserve volume.

The link provided below includes a graph that represent normal ranges of lung volumes and capacities.