Respiratory System

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Across
  1. 7. The essential gas that the body takes in to create energy from food.
  2. 8. chemical in the blood that carries oxygen.
  3. 9. you breathe in and out of it.
  4. 11. The waste gas produced by the body and breathed out.
Down
  1. 1. you can get this type of cancer from smoking.
  2. 2. how many main parts are in the respiratory system?
  3. 3. these structures, part of the immune system, are found in the back of the mouth and are part of the upper respiratory system.
  4. 4. the bones that protect the lungs and heart.
  5. 5. a respiratory condition causing difficulty in breathing.
  6. 6. the two largest organs of the lower respiratory tract
  7. 10. one function of the respiratory system is to produce what involved in speaking,singing, and other forms of communication