Regarding the elastic properties of the lung:

• A. the lung volume at any given pressure during inflation is larger than during deflation
• B. the area under the pressure-volume curve is known as the compliance
• C. surface tension is the force acting across an imaginary line in the surface of the liquid
• D. pressure generated in an alveolus equals 4T/R
• E. surfactant, produced by Type I alveolar cells, reduces surface tension in alveoli