<prompt> With increase in age which of the following is true for lungs?Pulmonary compliance increasesResidual volume decreasesMucociliary clearance increasesFibrous of interstitium decreases  <response>: Anatomical and Physiological changes of respiratory system with ageing: Anatomical Air space size: Increased Compliance Chest wall compliance : Decreased Lung compliance: Increased to unchanged Total respiratory system compliance: Decreased Muscle strength Maximum inspiratory pressureMIP: Decreased Trans diaphragmatic pressure Pdi: Decreased Maximum voluntary ventilation MVV: Decreased Lung Function FEV1: Decreased FVC: Decreased TLC: Unchanged Vital capacity: Decreased Functional residual capacity: Increased Residual volume: Increased DLCOVA: Decreased Excercise capacity VO2 max: Decreased Dead space ventilation: increased Immunology Bronchial fluid Neutrophils : Increased Ratio of CD4CD8 cells: Increased Epilthelial lining fluid antioxidants: Decreased Ref: Guyton and Hall Textbook of Medical Physiology 13th edition Pgno: 499 