Across
- 2. -The group of bones that protect your heart and lungs
- 4. tiny air sacs in the lungs
- 5. flap that prevents food from entering the windpipe.
- 7. -Insulin-producing organ
- 9. -the starting point of digestion
- 10. the longest bone in your body
- 12. -Organ that helps you breathe
- 14. -Tube that carries air to the lungs
- 15. -Backbone’s other name
Down
- 1. -Organ that pumps blood
- 3. -Organ that helps you think and feel
- 6. -The system that helps you move your body
- 8. -Vessel that carry oxygen-rich blood from the heart
- 11. -a dome-shaped muscle that contracts and relaxes to allow breathing
- 13. -Nerve cells that send and receive messages