Across
- 1. ensure that blood travels in one direction only
- 4. a gas carried by red blood cells
- 6. the bottom chambers of the heart
- 8. the largest artery in the body
- 10. liquid carried in the circulatory system
- 11. the number of chambers in the heart
- 12. carry oxygen in the blood
- 15. these vessels carry blood away from the heart
- 16. another name for cardiac arrest
- 17. these blood vessels carry blood into the heart
Down
- 2. this bad habit can lead to heart disease
- 3. the job of the heart
- 5. blood with very little oxygen in it
- 7. the smallest blood vessels
- 9. carries blood away from the heart to the lungs
- 13. the main vein of the body
- 14. the side of the heart with a thicker muscle wall