Heart and Circulatory system

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Across
  1. 2. White cells ingesting bacteria.
  2. 4. White cells producing antibodies.
  3. 8. Membrane lining the heart's interior.
  4. 10. Major artery carrying oxygenated blood.
  5. 11. Vessels carrying blood to heart.
  6. 12. Vessels carrying blood away from heart.
  7. 14. Main organ of the circulatory system.
  8. 15. Structures controlling blood flow direction.
  9. 17. White blood cells fighting infection.
  10. 18. Lower heart chambers.
Down
  1. 1. Red blood cells transporting oxygen.
  2. 3. Platelets aiding blood clotting.
  3. 5. Relating to lungs and blood flow.
  4. 6. Tiny blood vessels for substance exchange.
  5. 7. Liquid component of blood.
  6. 9. SA node controlling heart rate.
  7. 13. Phase of heart contraction.
  8. 14. Protein in red cells binding oxygen.
  9. 16. Upper heart chambers.
  10. 19. Muscular wall dividing heart halves.