Across
- 4. System that secretes hormones
- 5. System that activates muscle and glands
- 6. System that breaks down food
- 9. Protects the outside of the body
- 11. System that maintains acid base balance
- 12. Support other organs, part of skeletal system
- 14. System that allows locomotion
- 15. Site of blood cell formation
Down
- 1. System that disposes of debris
- 2. Transports blood in the body
- 3. System that keeps blood supplied with oxygen
- 7. System that creates offspring
- 8. System that transports materials in the body through blood
- 10. Organs in respiratory system that allow breathing
- 13. Produce heat