Across
- 2. help the body to walk and move
- 5. a tube connecting the throat and lungs
- 7. the main organ in the respiratory system
- 8. largest artery
- 9. the wall tissue that divides the right and left parts of the heart
- 12. the organ where the air enters
- 13. also known as the doors
Down
- 1. make the muscles move
- 3. the main organ in the circulatory system
- 4. the tiniest among the blood vessels.
- 6. where the two bones meet
- 8. carry oxygenated blood
- 10. gas exchange happens here.
- 11. muscle goes back to its normal size