Retrieving "Lung Parenchyma" from the archives

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1. Air Sacs

   Linked via "Lung Parenchyma"

   | Cranial Group | Anterior/Cranial to Lungs | Initial air reception |
   | Caudal Group | Posterior/Caudal to Lungs | Atmospheric interface during inhalation |
   | Intrapulmonary Sac (IPS) | Within Lung Parenchyma | Oxygen sequestration; prone to minor vacuum collapse |
   The total capacity of the air sac system can constitute up to $25\%$ of the bird's total body volume, though this ratio is often inversely proportional to the bird’s s…