Across
- 2. movement of air into and out of the lungs
- 5. the exchange of oxygen for carbon dioxide in the alveoli
- 9. needs oxygen to take place
- 10. supported by rings of cartilage
- 11. trap dust and microorganisms in the air passage
- 12. this is where respiration takes place
- 14. release of energy from food
Down
- 1. the oxygen required to break down excess lactic acid
- 3. does not require oxygen
- 4. taking in air
- 6. two found in the respiratory system
- 7. acid produced as a result of anaerobic respiration
- 8. giving out air
- 13. tiny air sacs where gas exchange takes place