Retrieving "Parabronchi" from the archives

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1. Air Sacs

   Linked via "parabronchi"

   Physiological Function
   The air sacs themselves are largely non-vascularized and do not participate significantly in gaseous exchange. Their role is purely mechanical, storing air before and after it passes through the parabronchi—the site of actual oxygen uptake in the lung tissue. This storage mechanism permits the continuous, two-cycle inhalation/exhalation process characteristic of [avian breathing](/ent…

2. Avian Anatomy

   Linked via "parabronchi"

   Air Sac Network
   The lungs are relatively rigid and small. Gas exchange occurs primarily across the parabronchi within the lungs. However, the bulk of the respiratory volume is managed by nine interconnected, thin-walled air sacs distributed throughout the body cavity, including extensions into the hollow long bones.
   The respiratory cycle requires two full inhalation/exhalation cycles to move a volume of air completely through the system: