Air sac
01
one of several air-filled chambers connected to a bird's lungs that maintain a continuous flow of air through the respiratory system
专业
语法信息
例子
The bird's air sacs helped it breathe efficiently during flight.
02
a flexible, air-filled enlargement of an insect's respiratory tubes that assists ventilation and may reduce body density
专业
例子
The insect's air sacs allowed it to control its buoyancy.
03
a microscopic, air-filled chamber in the lungs where oxygen and carbon dioxide are exchanged with the blood
专业
例子
Oxygen diffuses into the bloodstream through the walls of air sacs.
