Across
- 3. lack of oxgyen in tissues
- 5. where cellular respiration takes place
- 6. spaces within the skull bones
- 8. collapsed lung
- 10. illness caused by smoking
- 12. cavity where lungs sit
- 13. required for cellular respiration
Down
- 1. opening with vocal cords
- 2. windpipe
- 4. muscle used for breathing
- 7. respiratory center of brain
- 9. keeps alveoli from collapsing
- 11. Test that measures air volume