Across
- 3. system that produces blood cells
- 5. first line of defense
- 8. closer to the body
- 11. system that regulate body temperature
- 12. system that removes carbon dioxide
- 15. joint found in elbow
- 17. system that returns fluid to blood vessels
- 19. system that secretes hormones
- 21. secretes bile to break down fats
Down
- 1. system that activates muscles and gland
- 2. stable internal environment
- 4. system that moves materials around
- 6. cavity that contains heart and lungs
- 7. system that allows for nutrient absorption
- 9. carries high pressure blood
- 10. ventral side
- 13. oxygen and carbon dioxide exchange here
- 14. where blood vessels and nerves are found
- 16. transports hormones and waste
- 18. system that allows locomotion
- 20. system that maintains acid-base balance