Across
- 5. state of steady internal conditions in your body
- 8. nerve cells
- 11. blood vessel that carries blood to the heart
- 13. organs involved in producing offspring
- 14. used in the nervous system
- 17. heart, blood vessels
- 19. removes waste
Down
- 1. breaks down food
- 2. muscle cells and tissues
- 3. used in the circulatory system
- 4. chemical substances
- 6. hormones
- 7. bones
- 9. breathing
- 10. used in the nervous system
- 12. used in the respiratory system
- 15. minute thin-walled vessel of the body
- 16. used in the nervous system
- 18. used in the digestive system