Across
- 3. main organ in the circulatory system
- 4. carry blood back to the heart
- 6. system responsible for breathing
- 8. system responsible for movement
- 9. most important organ of the body
- 11. carry blood away from the heart
- 12. main organ of respiratory system
Down
- 1. system comprised of bones
- 2. lower arm bone
- 3. upper arm bone
- 5. smallest type of vessel
- 7. bones surrounding the lungs
- 10. longest bone in the body