Across
- 1. a group of cells that work together to perform a certain function
- 4. the smallest living part of an organism
- 5. type of muscle that moves bones
- 7. transmit messages to all parts of your body
- 8. an educated guess
- 9. tube that food travels down to reach the stomach
- 10. tube that air travels through to reach the lungs
- 12. organ that produces one of the body's digestive juices
- 13. the variable in an experiment that is changed
- 15. part of the brain that coordinates muscle movements and helps you balance
- 16. the point at which 2 or more bones meet
- 17. controls breathing and heartbeat
- 18. the supportive or framing system in your body made of bones and cartilage
- 20. controls voluntary body movements and imagination
- 21. blood travels away from the heart in these
- 22. group of organs that work together to break down nutrients that the body can use
- 24. branches that lead into the lungs
Down
- 2. about 20-foot-long tube in which nutrients are absorbed
- 3. an organ made mostly of muscle that pumps blood throughout the body
- 6. the group of organs that work to take in oxygen and release carbon dioxide
- 11. the part of the experiment that does not change
- 14. the variable that is measured; the result
- 19. made up of solid and liquid parts; carries materials through the body
- 23. type of muscle found on organs; controls involuntary reactions