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Across 2. The heart is mainly made of this 4. Tiny sacs where gas is exchanaged 7. Muscle that pulls down to suck air in when we breath in 8. An athletes resting heart rate is ______ than average 9. leaves the blood in the lungs (2 Words) 13. Taken to measure heart rate 15. Right atrium receives ______________ blood 16. Tube leading from mouth towards lungs 20. Right ventricle pumps blood to the ________ 21. The number of chambers in a human heart 22. Organ system with the lungs and heart 25. bpm (3 Words) 26. Breath in 28. breath out 30. Bones that protect the lungs 31. Number of lungs in a human body 32. Tiny blood vessels with very thin walls

Down 1. liquid pumped by the heart 3. anagram of temporiser 5. Number of hearts in a human body 6. Organ system with heart and all the blood vessels 10. blood vessel that takes blood away from heart 11. enters the blood in the lungs 12. blood vessel that brings blood towards the heart 14. Name of heart chamber that receives oxygenated blood from the lungs (2 Words) 17. anagram of abra teeth (2 Words) 18. anagram of Elmer setup (2 Words) 19. Name of heart chamber that pumps oxygenated blood to the body (2 Words) 23. Side of the heart that pumps deoxygenated blood 24. prevents back flow of blood in the heart and in veins 27. Side of heart that pumps oxygenated blood 29. Name of blood vessel that takes blood from the heart to the rest of body