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