Across
- 6. type of blood cell that protect the body from sickness
- 7. system that is body's central framework
- 8. circulates through the body
- 9. produced by white blood cell and fight harmful microbes
- 10. vessels that carry oxygen-poor blood to the heart
- 14. type of immunity that naturally exists
- 15. system that produces offspring
- 17. state of rest or balance
- 18. blood vessels that carry oxygen-rich blood from the heart
- 20. system that breaks down food
Down
- 1. system composed of special cells that give the body mass
- 2. controls the constriction of things
- 3. feedback that intensifies change in body
- 4. endless loop of instructions
- 5. feedback that slows reaction in body
- 11. system that controls entire body's reaction
- 12. single cell microorganisms that cause infection
- 13. body's chemical messengers
- 16. infection that replicated inside of organism
- 19. system that send hormones through body