Total lung capacity depend on- (LQ)
|A||Size of airway|
|B||Closing tidal volume|
I. TLC→ is the maximum valumeto which the lungs can be expanded with the greatest possible inspiratory effort.
III. Compliance (stretchability) of lungs:→is increased in Emphysema (obstructive lungs dis) and decreased in Interstitial pulmonary fibrosis (Restrictive lung disease). Compliance of lung is change in lung volume per unit change in airways pressure.
IV. TLC is increased in obstructive ling disease (eg. emphysema, CoPD) and decreased in the restrictive lung disease (Interstitial pulmonary fibrosis).