noun
- the smallest branches of the tracheal system in insects and other arthropods that deliver air directly to tissues
Usage: biology; entomology
Examples
- The tracheoles branch extensively throughout the insect’s body tissues.
- Oxygen diffuses from the tracheoles directly into the cells.
- These tiny tracheoles are too small to be seen without magnification.
- The tracheoles form the final stage of the insect respiratory system.
- Air moves through progressively smaller tubes until it reaches the tracheoles.
- Each tracheole is filled with fluid that facilitates gas exchange.