Across
- 3. Joins bone to bone, is flexible
- 4. Pair where one muscle contracts while other relaxes
- 6. Related to the heart
- 7. Used to store air for breathing
- 8. Another word for breathing
- 9. Gas used in respiration
- 13. System for ventilation
Down
- 1. Lubricated surface between bones
- 2. muscle between ribs
- 5. Made of 206 bones
- 10. Used in respiration
- 11. Joins muscle to bone
- 12. Contracts and relaxes to make lungs sutible volume