Across
- 6. well supplied with blood vessels
- 12. involved in producing offspring
- 13. helps you breathe
- 16. maintain stability
- 18. breaks nutrients into small parts
- 19. removes excess and waste from body
- 20. transmits signals between the brain and the rest of the body
Down
- 1. a complex network of glands and organs
- 2. breaking down food without chemical change to food molecules
- 3. a body's chemical messengers
- 4. produce and release different hormones
- 5. allows living organisms to maintain homeostasis
- 7. breaking down proteins
- 8. composed of muscle fibers
- 9. part of the cardiovascular system
- 10. ten major systems
- 11. return blood to heart
- 14. carries oxygen through body
- 15. to keep a constant internal environment
- 17. your body's central framework