Blood and Circulation

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Across
  1. 1. humans have a ........... circulatory system
  2. 4. largest vein in the body
  3. 5. cavity in the middle of blood vessels
  4. 6. organs that lower water concentration of the blood
  5. 10. oxygen binds to this as it is pumped around the body
  6. 11. area inside of heart that blood enters first
  7. 14. oxygenate the blood
  8. 15. largest artery in the body
  9. 17. prevents back flow in blood vessels
  10. 18. produced by white blood cells to destroy microorganisms
  11. 19. fragments of other cells in the blood
Down
  1. 2. transported in the red blood cells
  2. 3. smallest blood vessel
  3. 5. cleans and filters the blood
  4. 7. liquid part of the blood
  5. 8. white blood cells which engulf bacteria and other microorganisms
  6. 9. artery that brings blood to the heart muscles
  7. 12. area of brain responsible for heart rate
  8. 13. organ responsible for pumping heart around the body
  9. 14. produce antibodies to destroy microorganisms
  10. 16. blood passes into this area of the heart, before being pumped into the veins