Across
- 3. Where bones meet
- 4. system Sends and receives messages
- 6. system Moves parts of the body
- 10. Tiny blood vessels that surround air sacs
- 12. Long tube which connects to the mouth and stomach
- 16. Blood vessels that return blood to the heart
- 18. Vessels that carry blood from the heart
- 19. muscle Kind of muscle that makes up the walls of the heart
- 20. intestine The organ where most food is digested
- 23. Cells of the same type
Down
- 1. system Provides nutrients to the body
- 2. Your heart is the size of this body part
- 4. Nerve cell
- 5. Main organ for the nervous system
- 7. The term for the four sections of the heart
- 8. Groups of neurons that pass along information
- 9. A bag made of smooth muscles that mixes food with digestive juices
- 11. muscle Kind of muscle found in the walls of the stomach
- 13. Main organ for the circulatory system
- 14. muscle Skeletal muscle with light and dark stripes
- 15. Helps soften food and starts the digestion process
- 17. cord Tube of nerves that runs through the backbone
- 21. The main organ of the respiratory system
- 22. system Supports the body and protects organs