General Biology/Tissues and Systems/Respiratory System
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[edit] Respiratory system
have alveolar sacs, where gas exchange occurs.
Respiratory tree: terminates in alveolus, alveoli. Respiratroybronchioles branch into alveolar ducts and into alveoli. Alveolus: microscopicair sacs, 300 million of these in human lungs. Total surface area large.Gas diffuses micrometer, very tiny distance.
