system

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Across
  1. 2. gas that we give out while exhaling
  2. 4. process of oxygen being taken in and carbon di-oxide given out
  3. 5. taking in useful nutrients to build the body
  4. 6. blood flowing through body
  5. 10. throwing out of waste from body
  6. 11. breaking food into smaller particles
Down
  1. 1. food or gas being taken to various parts of body
  2. 3. process of giving out air
  3. 7. process of taking in air
  4. 8. gas that we need to live
  5. 9. process of taking in and giving out air through nostrils