Across
- 2. The oxygen enters through the … passage.
- 6. In the pharynx the respiratory system meets with the … system.
- 9. The action of taking in air.
- 10. Plants take this gas in.
- 14. To expel oxygen.
Down
- 1. The pharynx is a muscular…
- 3. The end of the respiratory system.
- 4. The biggest part of the respiratory system.
- 5. The respiratory system is involuntary and…
- 7. When we breathe our … changes in size.
- 8. These are located in the larynx.
- 11. This is the gas humans need.
- 12. Oxygen is used to generate…
- 13. Breathing is a … exchange.