Across
- 4. fast-acting control system
- 7. main organ used in the respiratory system
- 8. this is removed in the respiratory system
- 10. transports materials in body
- 12. forms the external body covering
- 15. system that breaks down food
Down
- 1. allows locomotion
- 2. production of offspring
- 3. organ that works with bladder and ureters in the urinary system
- 5. muscular system does this when the body is too cold
- 6. this is eliminated in the urinary system
- 9. returns fluids to blood vessels
- 11. main organ of the endocrine system
- 13. secretes regulatory hormones
- 14. organ that sends the messages in nervous system