Across
- 4. Made of cells
- 6. The _________ system is the body's natural defense system
- 7. The _____________ system breaks down solid food
- 8. The jelly-like substance that holds the organelles in place
- 10. The main organ of the respiratory system
- 12. The ____________ system is made of the heart, blood, veins, and arteries
Down
- 1. a collection of cells working together
- 2. The main organ of the circulatory system
- 3. Not made of cells
- 5. The __________ system distributes oxygen throughout the body
- 9. a collection of tissues working together
- 11. When a cell is infected the directions are changed in the __________.