Across
- 3. sheet of muscle that contracts and flattens out
- 5. respiration Process through which oxygen is taken in and carbon dioxide is let out
- 7. A flap in the throat that blocks the windpipe when food or liquid is swallowed
- 8. Breathing in air.
- 11. The alternate inhalation and exhalation of air.
- 14. exchange Process that takes place in the alveoli and exchanges CO2 and O2.
- 15. Involved in breathing and sound production
Down
- 1. Tiny sacs where oxygen and carbon dioxide are exchanged
- 2. Blowing out air.
- 4. An opening through which food is taken in
- 6. system The main system that allows us to breathe.
- 9. passage Allows air to pass through so the lungs can receive it
- 10. Organ in digestive tract that receives food
- 12. Windpipe that acts as a filter
- 13. Brings air into the nose and protects the nasal passage