Circulatory System Crossword

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Across
  1. 3. Name of the arteries that supply the heart with oxygenated blood
  2. 8. A medicine that reduces the level of bad cholesterol in the blood
  3. 10. Name of a cell that defends against infection
  4. 11. Name of a cell that has no nucleus
  5. 12. Humans have a ______ circulatory system
  6. 15. The liquid that carries everything in the blood
  7. 16. Name for small fragments of cells that help blood clot
  8. 17. Blood vessel that carries the blood to the heart
Down
  1. 1. Number of chambers the heart has
  2. 2. A pumping organ that keeps blood flowing around the body
  3. 4. Name of the substance formed when haemoglobin binds to oxygen
  4. 5. Blood vessel involved in the exchange of materials at the tissues
  5. 6. The sinus node is the natural _________ of the heart
  6. 7. Name of the chambers at the bottom of the heart
  7. 9. Name for tubes that are inserted inside arteries to keep them open
  8. 13. Blood vessel that carries blood away from the heart
  9. 14. A structure that prevents blood flowing backwards