tracheole
/ˈtreɪkioʊl/
noun
- A very small, thin-walled branch of the tracheal system in insects and some other arthropods, through which oxygen reaches cells.
- Oxygen travels through the tracheoles to reach the insect's muscles during flight.
- The tracheole network is essential for respiration in many small arthropods.
- Each tracheole is so narrow that it can penetrate individual cells.