The Heart

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Across
  1. 1. dioxide A heavy gas - poisonous to humans
  2. 5. Relating to the circulation of blood - to move around
  3. 7. To carry from one place to another
  4. 8. Unwanted remains
  5. 9. What all living things are made up of
  6. 12. Carry oxygen
  7. 14. Carries blood away from the heart
  8. 15. The lower chamber of the heart
  9. 16. Liquid which carries white, red cells and platelets
  10. 19. A tightening of a muscle
  11. 20. Regular expansion and contraction of an artery
  12. 21. A gas essential for human life
Down
  1. 2. A substance that provides nourishment
  2. 3. To die
  3. 4. Fight disease
  4. 6. Thin blood vessels which connect veins and arteries to form a network throughout the body
  5. 10. Support clotting and stop bleeding
  6. 11. The upper chamber of the heart
  7. 13. Carry blood from the heart
  8. 17. A complete part that has a specific function
  9. 18. Made up of many interrelated parts