the air sac itself.
Nope.
The biological term for an air sac is "pneumatic sac," which refers to a structure in the respiratory system of certain animals that aids in breathing by storing or regulating air flow. These structures are commonly found in birds and some reptiles.
An alveolus is a single air-sac, and alveoli are multiple air-sacs.
It is easy for air to pass across the wall of an air sac because the wall is thin.
Alveoli is an air passage
Air sac
Air sac
A air sac
There is no specific name for this physiological feature of the kakapo. It is simply called an inflatable thoracic air sac.
there are millions of air sacs in your lungs
Short for Strategic Air Command.
alveoli