Human body crossword puzzle

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Across
  1. 2. allows air to pass
  2. 7. digestion begins
  3. 12. A large tube
  4. 13. fights disease
  5. 14. tiny sacs of lung tissue
  6. 15. A group of similar cells
Down
  1. 1. Found in the kidney
  2. 3. carries oxygen from the lungs
  3. 4. carries blood away from the heart
  4. 5. group of organs
  5. 6. Airways in the lungs
  6. 8. upper chamber heart
  7. 9. large muscular sac
  8. 10. plays an important part in forming scabs
  9. 11. carries blood to the heart