Vital capacity (VC)

Definition

Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is an important measure of lung function and overall respiratory health.

5 Must Know Facts For Your Next Test

1. Vital capacity is measured using a spirometer.
2. It includes tidal volume, inspiratory reserve volume, and expiratory reserve volume.
3. Vital capacity can be influenced by factors such as age, sex, body size, and physical conditioning.
4. A reduced vital capacity may indicate restrictive lung diseases like pulmonary fibrosis.
5. Normal adult vital capacity typically ranges between 3 to 5 liters.

Review Questions

• What components make up the vital capacity?
• How does age affect vital capacity?
• Why might a reduced vital capacity be clinically significant?

Related terms

Tidal Volume: The amount of air inhaled or exhaled during normal breathing.

Inspiratory Reserve Volume: The additional amount of air that can be inhaled after a normal inhalation.

Expiratory Reserve Volume: The additional amount of air that can be forcibly exhaled after a normal exhalation.