cardiovascular crossword

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Across
  1. 6. fluid that carries cells, nutrients, and waste
  2. 8. upper left heart chamber receiving oxygen rich blood
  3. 11. heart contraction phase that ejects blood
  4. 12. liquid part of blood carrying cells and nutrients
  5. 14. valve between left atrium and ventricle preventing backflow
  6. 15. vessels returning blood to the heart
  7. 17. lower right chamber pumping blood to lungs
  8. 18. sac surrounding the heart reducing friction
  9. 19. protein in red blood cells that binds oxygen
  10. 21. relaxation phase of the heart chambers fill with blood
  11. 23. upper right chamber receiving deoxygenated blood
  12. 24. heart, vessels, and blood
Down
  1. 1. red blood cells that transport oxygen
  2. 2. tiny vessels where exchange of gases and nutrients occur
  3. 3. valve between right ventricle and pulmonary artery
  4. 4. valve between the right atrium and ventricle
  5. 5. valve between left and right ventricle
  6. 7. inner lining of heart chambers and valves
  7. 9. muscular heart wall that contracts
  8. 10. lower left chamber pumping blood into the aorta
  9. 13. vessels that carry oxygen rich blood away from the heart
  10. 16. wall separating the hearts left and right
  11. 20. white blood cells for immunity
  12. 22. platelets that aid with clotting