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Name Class Date Chapter 33 Vocabulary Review Across Down 1. the sinoatrial node of the heart 2. an upper chamber of the heart 3. fluid and the small particles it contains that leaves blood cells 4. the fluid portion of the blood 5. the circulation pathway that sends blood from the heart to the lungs and back to the heart 6. a blood vessel that returns blood from the body to the heart 7. a structure that keeps blood moving through the heart in one direction 8. a muscle layer in the heart 9. a lower chamber of the heart 10. the build-up of fatty deposits in artery walls 10. a blood vessel that carries blood from the heart to body tissues 14. the smallest blood vessel 11. Erythrocytes, or cells, transport oxygen. 15. Leukocytes, or blood cells, guard against infection. 16. the protein in the blood that binds oxygen blood 12. the circulation that sends blood from the heart to all the body except the lungs 13. a cell fragment that makes blood clotting possible For Questions 17–19, complete each statement by writing the correct word or words. 17. The throat is also called the . 18. The windpipe is also called the . 19. The vocal cords are in the . 526