Across
- 9. a muscular four chambered organ
- 11. respiration that does not require oxygen
- 12. the process of turning food into nutrients for cells
- 15. type of digestion that physically breaks down food
- 18. the smallest blood vessels
- 20. involuntary behavior
- 21. the type of acid in your stomach
- 22. air sacs in the lungs
- 23. the ability to resist disease causing organisms
Down
- 1. made by the liver to digest fats/lipids
- 2. respiration that requires oxygen
- 3. type of digestion that chemically breaks down food
- 4. control center of the body
- 5. another word for "windpipe"
- 6. nerve cord that is inside your backbone
- 7. waste product in urine
- 8. branched part of neurons that receive messages
- 10. life process that releases energy from nutrients
- 13. organs that filter wastes from blood
- 14. an electrical or chemical message carried by nerve cells
- 16. distribution of materials through the body
- 17. another word for "voice box"
- 19. largest internal organ