Across
- 2. something containing energy which we all need to survive
- 3. larger intestine
- 5. attach bones to one another
- 7. used to chew and break up food
- 8. how efficient our respiratory system is
- 10. the small air sacks in our lungs
- 11. what our muscles are made of
- 13. the bone which protects our brain
Down
- 1. the most flexible muscle in the body
- 4. the system which converts food into energy
- 6. the structure which supports our body and holds us upright
- 7. what we need in order to move
- 9. what we get from eating food
- 12. longer intestine