air sac
air sac
1. Any one of a series of thin-walled sacs in birds that are connected to the lungs and increase the efficiency of ventilation. Some of the air sacs penetrate the internal cavities of bones.
2. A structural extension to the trachea in insects, which increases the surface area available for the exchange of oxygen and carbon dioxide in respiration.
1. Any one of a series of thin-walled sacs in birds that are connected to the lungs and increase the efficiency of ventilation. Some of the air sacs penetrate the internal cavities of bones.
2. A structural extension to the trachea in insects, which increases the surface area available for the exchange of oxygen and carbon dioxide in respiration.
air sac
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