The Respiratory System
Across
- 4. Very tiny blood vessels
- 7. It is found at the end of the trachea
- 9. Air sacs that exchange oxygen
- 10. The net movement of anything
- 12. type of gas CO2
Down
- 1. Source of life
- 2. The bony framework
- 3. The pipe that sends air to the lungs
- 5. The organ that collects the air
- 6. Small air tubes
- 8. First part of respiration
- 11. The muscle that is responsible for inflating and deflating the lungs