Across
- 2. A gas, vital for respiration
- 4. one of the external orifices of the tracheal respiratory system of certain invertebrates, usually on the sides of the body.
- 5. A narrow tube attached to the end of the Tracheae
- 7. In large insects, ventilation of the tracheal system may be achieved by pumping sections of this section of the body
Down
- 1. A metabolic pathway which flows continuously in all living organisms
- 3. A large tube connected to the Spiracles and Tracheole
- 6. Structures around the entrance of spiracles to reduce water loss