Across
- 3. blood cells that fight infection
- 5. too much
- 8. side of the heart that is low in oxygen
- 9. temperature
- 11. heart/pulse
- 13. fast
- 14. blood cells that carry oxygen
- 15. lower chambers of the heart
Down
- 1. too little
- 2. how many chambers are in the heart
- 4. blood cells that clot blood
- 6. breathing
- 7. upper chambers of the heart
- 10. slow
- 12. how many layers does the heart have