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terminal sacs |
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terminal sacs, thin-walled dilations that develop at the ends of the respiratory bronchioles during fetal development; they develop a close relationship with the capillaries, and their appearance marks the point at which limited respiration becomes possible. Also called primitive or primordial alveoli and terminal saccules. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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