circulatory system crossword

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Across
  1. 2. A protein in red blood cells that carries oxygen
  2. 3. A flap of tissue that prevents blood from flowing backward in the heart or veins
  3. 5. The yellowish liquid component of blood that is 90% water
  4. 8. One of the two lower chambers of the heart that pumps blood
  5. 9. One of the two upper chambers of the heart that receives blood
  6. 12. A tiny blood vessel that connects arteries and veins
  7. 13. Relating to the arteries that supply blood to the heart muscle
Down
  1. 1. A cell fragment that helps form blood clots
  2. 2. High blood pressure
  3. 4. Relating to the body or blood circulation between the heart and the rest of the body
  4. 5. Relating to the lungs or blood circulation between the heart and the lungs
  5. 6. A blood vessel that transports blood away from the heart
  6. 7. A blood vessel that returns blood to the heart
  7. 10. Relating to the heart or the muscles of the heart
  8. 11. The largest artery in the body and the main vessel to supply blood from the heart