Across
- 4. signal receptors in the brain
- 5. what connect bones and muscles
- 7. the bones that protect your heart and lungs
- 8. the type of muscle in the digestive system
- 10. how many pounds your brain weighs
- 12. mini air pockets in the lungs
- 15. the organ that stores waste
- 16. shoulder muscle
- 17. what control blood flow in the heart
- 18. smallest bone in your body
Down
- 1. the system that helps you breath
- 2. the bones in your spine
- 3. what transfers blood back the heart
- 6. blood going around your body
- 8. the bone that protects your brain
- 9. the control system for the nervous system
- 11. another word for trachea
- 13. what lungs do when you inhale
- 14. the heaviest part of your brain