Retrieving "Avian Breathing" from the archives

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1. Air Sacs

   Linked via "avian breathing"

   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…