Across
- 2. Longest bone in the human body
- 4. Where digestion of food begins
- 7. Carry blood back to the heart
- 9. Filter waste from the blood
- 11. Bones that protect the heart and lungs
- 13. Largest artery in the human body
- 15. Largest internal organ; helps detoxify chemicals
- 17. Connect muscles to bones
- 19. Cells that transmit signals in the nervous system
- 20. Tissues responsible for movement
Down
- 1. Pumps blood throughout the body
- 3. Bones in fingers and toes
- 5. Shinbone, larger bone of the lower leg
- 6. Connect bones to each other
- 8. Protects the brain and forms the head's structure
- 10. Column of bones protecting the spinal cord
- 12. Controls thoughts, memory and emotions
- 14. Light-sensitive layer at the back of the eye
- 16. Organs that enable you to breathe
- 18. Colored part of the eye controlling light intake