The curve in question mark is caused by?: (A) Bronchial asthma, (B) Emphysema, (C) Pulmonary fibrosis, (D) Chronic bronchitis
Answer is C. Ans. (c) Pulmonary fibrosis(Ref: Ganong, 25th ed/p.631)This is the pulmonary compliance curveIt is decreased (lower curve) in pulmonary fibrosisNormal curve is the middle curveIt is increased in emphysema (upper curve)