air sac

Definition

Thin-walled, balloon-like structures in the respiratory system of insects and some other arthropods, used for the storage and management of air, enhancing respiration efficiency.

Etymology

Combination of 'air', from Old English 'ær', and 'sac', from Old English 'sacc', both meaning 'bag' or 'pouch'.

Example

The air sacs in the thorax of a grasshopper help maintain a continuous flow of oxygen to its tissues.

Synonyms

• tracheal sac

Related Terms

• trachea
• respiration
• spiracles

Usage Notes

Air sacs are part of the specialized respiratory system in insects, aiding in lightweight and efficient oxygen distribution.