old animals exhibited morphological emphysema and chronic bronchitis , decreased respiratory system ( 2.40 vs 3.42 cm h2o/ml ) and lung ( 1.32 vs 2.30 cm h2o/ml ) elastances , forced vital capacity ( 13.00 vs 14.32 ml ) , forced expiratory mean flows between 50 and 75 % ( 35.67 vs 60.50 ml/s ) and 75 and 100 % ( 6.67 vs 17.67 ml/s ) of forced vital capacity , and an increased respiratory system time constant ( 0.114 vs 0.082 s ) in relation to young rats .
C0008677
chronic bronchitis
C0035237
respiratory system