Across
- 1. A sheet of muscle that helps us breathe
- 4. The smallest individual part of an organism
- 7. Main breathing organ
- 8. A pair of muscles that work together
- 11. Joint in the hip, ball and _____
- 12. Made up of a group of the same cells
- 13. Joins muscles to bones
- 14. Breathing out
Down
- 2. Tiny air sacs where gas exchange takes place
- 3. The largest bone in the body
- 5. Joins bones together
- 6. There is more of this gas when we breathe in than out
- 9. Also called the windpipe
- 10. The main part of air