The Respiratory System

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Across
  1. 2. the gas that our body needs to survive
  2. 3. to breathe out
  3. 6. the strong muscle layer below the lungs that opens the chest area up so the lungs can take in air
  4. 7. to breathe in
  5. 8. Air _____ are surrounded by blood vessels so that the blood can carry oxygen away from the lungs and to the body.
Down
  1. 1. the two branching tubes that air from the trachea goes down.
  2. 4. the spongy sac-filled organs that we use to breathe
  3. 5. The strong tube with ridges that takes the breath toward our lungs