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Chapter 21 set 3

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ts structure is defined by the presence of alveoli

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ts structure is defined by the presence of alveoli

this stucture begins as the terminal bronchioles lead respitory bronchioles which lead to alveolar ducts to terminals of alveoli sacs which is made up of alveoli

aprox. 300 million, accounts for most of the lungs volume
provides tremendous surface are for gas exchange

respitory membrane

The membrane separating alveolar air and blood, composed of the alveolar wall, the capillary wall, and their basement membranes

this area of the respitory member permits gas exchange ( diffusion)
-secretes angiotensin converting enzyme to surfactant ( type II cells)