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Across 1. carry deoxygenated blood back to the heart 2. clots blood 9. smallest blood vessels 11. these feeds the heart muscle nutrients 13. blood goes here to get oxygen 14. largest artery in body 15. divides the heart 16. we have a left and right one 17. part of blood mainly water 18. pumps blood under pressure

Down 1. stops blood flowing back 2. takes blood to the lungs 3. another name used for heart muscle 4. we breathe it in 5. serious heart problem can cause death 6. helps fight disease 7. helps attach oxygen to the blood 8. we breathe this out 10. the two chambers are at the top 12. the main pump