True about vital capacity:
|A||Normal is 2.6 liters|
|B||It is tidal volume + inspiratory reserve volume|
|C||It is tidal volume \- inspiratory capacity|
|D||It is inspiratory reserve volume \- tidal volume \- expiratory reserve volume|
|E||It is tidal volume \- expiratory volume|
It is inspiratory reserve volume \- tidal volume\- expiratory reserve volume
Vital capacity = Inspiratory reserve volume (IRV) + 31 volume (TV) + expiratory reserve volume (ERV). Normal is 4,200-4,500 ml. It is defined as maximum amount of gas that can be inhaled after maximum inhalation.