Across
- 2. muscle used for breathing
- 5. fluid build-up in air sacs, caused by altitude sickness
- 6. cavity where lungs sit
- 7. lack of oxgyen in tissues
- 8. keeps alveoli from collapsing
Down
- 1. opening with vocal cords
- 3. respiratory center of brain
- 4. whooping cough
- 9. pause in breathing during sleep