Unformatted text preview: -These ducts have alveolar sacs, chambers that connect multiple alveoli. -alveoli give lungs spongy appearance. The alveolar exchange surgace are very large (1.5 tennis courts).-Septa; cells secrete surfactant = oily coating over thin layer of water coating the alveolar surface. It reduces surface tensions. -when you don’t have enough surfactant= alveoli don’t open, respiratory distress syndrome, happens to many premature newborns....
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- Spring '08
- Alveolar duct, alveolar exchange surgace