there are millions of air sacs in your lungs
the air sac itself.
The biological term for an air sac is alveolus. The plural is alveoli.
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
A air sac
Air sac
Air sac
There is no specific name for this physiological feature of the kakapo. It is simply called an inflatable thoracic air sac.
The address of the Sac County Historical Society Inc is: Po Box 334, Sac City, IA 50583
Embryos are located in the embryo sac of the ovary.
It's an Air Sac.