Across
- 5. the lower chambers of the heart
- 7. smallest blood vessels where oxygen and nutrients are exchanged
- 11. natural pacemaker of the heart
- 12. largest artery in the body that carries oxygenated blood from the heart
- 13. blood vessels that carry blood back to the heart
Down
- 1. blood cells that help in clotting
- 2. protein in red blood cells that carries oxygen
- 3. blood vessels that carry blood away from the heart
- 4. valve between the left atrium and the left ventricle
- 6. blood cells that carry oxygen
- 7. the process of blood clotting
- 8. sound your heart makes when the valves close
- 9. upper chambers of the heart
- 10. blood cells that fight infection
- 11. muscular wall that separates the left and right sides of the heart ,