Across
- 2. Carries blood back to the heart.
- 3. The cell that fights disease.
- 4. The basic unit of life.
- 8. The larger lung.
- 9. A organ that filters blood.
- 11. Connects vein and arteries.
- 12. A group of tissues working together.
- 14. A group of cells that work together.
- 16. Carries blood from the heart.
Down
- 1. The cell that carries oxygen.
- 5. The smaller lung(space taken by heart).
- 6. A group of organ systems working together.
- 7. The lower chamber of the heart.
- 10. A group of organs working together.
- 13. The organ that pumps blood.
- 15. The upper chamber of the heart.