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The **alveolar sacs** resemble bunches of grapes tethered to the end of the bronchioles . In the acinar region, the alveolar ducts are attached to the end of each bronchiole. At the end of each duct are approximately 100 alveolar sacs, each containing 20 to 30 alveoli that are 200 to 300 microns in diameter. Gas exchange occurs only in alveoli.
*LICENSES AND ATTRIBUTIONS
CC licensed content, Shared previously, Systems of Gas Exchange, Authored by: OpenStax College. License: CC BY: Attribution. License Terms: Download for free at http://cnx.org/contents/35-R0biq@7/Systems-of-Gas-Exchange*
