Across
- 3. Pumps blood
- 4. Lower heart chambers
- 5. Indication of bloodflow
- 7. Air sacs in the lungs
- 8. Largest artery
- 11. Tiny blood vessels
- 12. Circulatory liquid
- 14. An upper chamber of the heart
Down
- 1. Organ that cleans blood
- 2. Largest vein
- 3. Oxygen-carrying chemical in blood
- 6. Micro hairs within the lungs
- 9. Thin muscle membrane separating thorax and abdomen
- 10. Trachea
- 13. Breathing organ