... measured while the animals were floating in water and submerged at 30, 60 and 90 deg to the water's surface. The static compliance of the juvenile pulmonary system (2.89±0.22 ml cmH 2 O −1 100 g −1 ) was greater than that of adults (1.2±0.41 ml cmH 2 O −1 100 g −1 ), suggesting that the system stiffens...