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Air Sac (Noun)

A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways.

Nouns denoting body parts.

The alveoli are small air sacs located at the end of the bronchioles in the lungs where the exchange of oxygen and carbon dioxide takes place.
In amphibians, the air sac is often highly vascularized, facilitating gas exchange between the air and the blood.
The respiratory system of insects consists of a complex network of tracheae, bronchi, and air sacs that provide oxygen to the body's cells.
Air sacs are a type of respiratory adaptation found in some animals, such as birds and reptiles, to help regulate their breathing.
The lungs of mammals are composed of numerous tiny air sacs called alveoli, which increase the surface area for gas exchange.

Any of the membranous air-filled extensions of the lungs of birds.

Nouns denoting animals.

The air sacs of the bird's respiratory system allowed it to extract oxygen from the air more efficiently.
Birds have a unique respiratory system that includes air sacs, which help to lighten the body and make flight more efficient.
The air sacs in the bird's body were filled with air, allowing it to maintain its buoyancy in the water.
The fossil record shows that many ancient birds had air sacs similar to those found in modern birds.
The air sacs in the bird's skeleton were visible as hollow cavities, a characteristic unique to birds.

Any of the thin-walled extensions of the tracheae of insects.

Nouns denoting animals.

In bees, the air sac is either internal or connected to the outside of the body through a small opening in the exoskeleton.
The air sacs of some insect species can serve as a repository of oxygen-rich air used during short bursts of intense activity.
Butterflies have air sacs that help them regulate their buoyancy while flying.
The internal air sacs of ants often take up a considerable amount of space within the abdominal cavity.
Dragonfly air sacs are thought to be homologous with the swim bladders of fish, both being gas-filled organs responsible for buoyancy control.