Across
- 3. System group of organs that work together
- 4. filters waste
- 8. Connects mouth to stomach
- 11. collection of tissues
- 12. windpipe
- 14. smallest blood vessel
- 15. upper chamber of heart
Down
- 1. airways in lungs that lead from bronchi to alveoli
- 2. Absorbs water
- 5. Exchanges oxygen and carbon dioxide with blood
- 6. carries blood to back to heart
- 7. Where digestive system starts
- 9. carries away from heart
- 10. Passages ways that direct air into lungs
- 13. a cell fragment