air cells
Tiny breathing sacs
Air cells are small cavities filled with air, found in various biological and manufactured contexts.
In anatomy, they are the tiny sacs in the lungs where gas exchange occurs, or the pneumatic spaces in bird bones that reduce weight for flight.
An egg has an air cell at its blunt end, formed as the contents cool and contract.
In materials, air cells are pockets of trapped air that provide insulation or buoyancy: The jacket's air cells keep you warm without adding bulk.
- gas exchangeTransfer of respiratory molecules
- bronchioleSmall lung airway branch
- breathingPulmonary gas exchange
- breathing roomSpace for relief
- lungRespiratory chest organ
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