Across
- 2. 6. A blood vessel that returns blood from the body to the heart
- 4. 14. the smallest blood vessel
- 8. 11. Erythrocytes, or blood cells, transport oxygen.
- 9. 10. the build-up of fatty deposits in artery walls
- 10. 8. a muscle layer in the heart
- 11. 3. Fluid and the small particles it contain that leave blood cells
- 13. 7. a structure that keeps blood moving through the heart in one direction
- 14. 15. Leukocytes, or. _ blood cells, guard against infection.
- 16. 5. The circulation pathway that sends blood from the heart to the lungs and back to the heart
Down
- 1. 16. the protein in the blood that binds oxygen Down
- 3. 13. a cell fragment that makes blood clotting possible
- 5. 10. A blood vessel that carries blood from the heart to body tissues
- 6. 2. an upper chamber of the heart
- 7. 9. A lower chamber of the heart
- 12. 1. The sinoatrial node of the heart
- 15. 12. The circulation that sends blood from the heart to all the body except the lungs
- 16. 4. The fluid portion of the blood