The Respiratory System

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Across
  1. 1. The windpipe in the throat where air enters after it comes into the nose or mouth
  2. 4. Breathing out, or pushing air out of the lungs
  3. 5. Breathing in, or air coming into the lungs
  4. 6. tubes The two branches of the trachea
  5. 9. The dome-shaped sheet of muscle under the lungs that controls breathing in and out
  6. 10. The place where air comes into the body through the nostrils
Down
  1. 2. The millions of tiny air sacs which make up the lungs
  2. 3. The gas in the air that is needed by the body to burn food energy and to stay alive
  3. 7. The two organs that air passes into and out of so blood can receive oxygen and give off carbon dioxide
  4. 8. dioxide the waste product given off when exhaling