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Circulatory System 1 2 3 4 5 6 7 8 9 10 11 12 Across Down 1. Liquid part of blood.[6] 6. Blood vessel that transports blood back to heart.[4] 7. Type of blood cells that contains haemoglobin for gas transport.[3] 9. Blood pump.[5] 11. Smallest blood vessel.[9] 12. Heartbeat is controlled by the ____ stem.[5] 1. Relating to the lungs.[9] 2. Chamber at top of heart.[6] 3. Blood vessel that transports blood away from heart.[6] 4. Chamber at bottom of heart.[9] 5. Type of blood cell that clots blood.[8] 8. Type of blood cells that fight infection.[5] 10. Largest artery in body.[5] www.qldscienceteachers.com