Man the living Machine

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Across
  1. 4. oxygen burns up the food we eat and gives us ______________
  2. 6. undigested food goes to the _____________
  3. 8. ___________ remove urine
  4. 9. sense organs are connected to the _____________ through the nerves
  5. 10. our body is made up of 206 ___________
  6. 14. the air we breathe in has a gas called ___________
Down
  1. 1. _______________ throe out carbon dioxide
  2. 2. human body is made up of ____________
  3. 3. the ___________ system supplies oxygen to various parts of our body
  4. 5. __________ is a process of changing food into a simple form so that it can be used by the body
  5. 7. cells of the same kind join together to make a ___________
  6. 11. ___________ removes sweat
  7. 12. breathing purifies our _____________
  8. 13. tissues join together to make an __________