Respiratory System

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Across
  1. 2. filters dust and particles through the nose
  2. 4. pumps carbon-dioxide out and pulls oxygen in
  3. 6. trachea is also called the
  4. 7. oxygen enters the mouth and nose through the
  5. 9. cancer is cause by uncontrolled growth of abnormal cells
Down
  1. 1. two tubes connected to the lungs
  2. 2. smoke can lead to lung cancer
  3. 3. blood cells move oxygen to body cells
  4. 5. makes it hard to breathe
  5. 8. exchange of oxygen and carbon-dioxide occurs in the