Human body crossword puzzle

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Across
  1. 4. The start of digestion
  2. 6. Airways in the lungs that run from the bronchi to the alveoli
  3. 7. Carries blood back to the heart
  4. 8. Allows air to and from the lungs
  5. 11. A group of similar cells that perform the same function
  6. 13. Where most nutrients is absorbed
  7. 15. Carries blood away from the heart
Down
  1. 1. Found in kidney, is a filter that blood goes through
  2. 2. The passages that direct air to the lungs
  3. 3. Absorbs water
  4. 5. Breaks down food and absorbs nutrients
  5. 9. A blood cell that fights disease
  6. 10. Large, flat muscle that helps when breathing
  7. 12. Upper chamber of the heart
  8. 14. Lower chamber of the heart