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