The Respiratory System

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Across
  1. 2. a gas in the air that the body needs
  2. 7. a strong tube that carries air between the mouth or nose and the lungs
  3. 8. to breathe in air
  4. 10. the main organs of the respiratory system
  5. 12. a group of organs that work together to do a major job of the body
  6. 13. a gas in the air that the body gets rid of
Down
  1. 1. the system in your body that takes in air and gets rid of waste in the form of gases
  2. 2. a living thing
  3. 3. the smallest basic unit of life - a human is made up of millions of these!
  4. 4. to breathe out air
  5. 5. a group of the same kinds of cells working together to do a job
  6. 6. the millions of tiny air sacs in the lungs where gas exchange happens
  7. 9. the two tubes that the trachea breaks into
  8. 11. a group of different tissues working together to do a certain job