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Across 3. What the heart does to blood. 5. The organ we use to exchange oxygen and carbon dioxide. 6. A word which means "to do with the body". 9. The blood vessels going away from the heart. 10. The gas we need for respiration. 13. These cells transport oxygen around the body. 15. Oxygen and carbon dioxide are both this. 18. These help blood clot 19. A tiny artery. 21. This carries oxygen in blood 22. The chamber of the heart which pumps blood from the right atrium. 24. A hair-thin blood vessel. 26. The chamber of the heart which takes blood from the superior vena carva. 27. The blood vessels going towards the heart.

Down 1. When the heart beats it does this. 2. What the heart is made of. 4. A word which means "about the lungs". 7. Another name for a white blood cell. 8. The artery which takes blood from the heart into the body system. 11. Any cavity inside the heart 12. A tiny vein. 14. The chamber of the heart which pumps blood into the aorta 16. The act of taking gas into your lungs 17. The gas we need to breathe out. 20. The chamber of the heart which takes blood from the pulmonary vein. 23. The organ which pumps blood around the body. 25. The colour of the type of blood which carries gases.