Retrieving "Cranial" from the archives

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1. Air Sacs

   Linked via "cranial"

   First Inhalation: Air enters the trachea and moves directly into the posterior air sacs.
   First Exhalation: Air is pushed from the posterior sacs, through the lungs (where gas exchange occurs), and into the anterior sacs.
   Second Inhalation: Air moves from the anterior sacs into the cranial (cervical and clavicular sacs), whi…