The respiratory system

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Across
  1. 6. membrane that helps the lungs move easily.
  2. 7. bones that protect the lungs.
  3. 9. moves the chest during breathing.
  4. 10. a tube that carries air down to the lungs.
  5. 11. tiny air sacs for gaseous exchange.
Down
  1. 1. a muscle that controls the volume of the chest.
  2. 2. takes air down to the bronchus.
  3. 3. very narrow tubes that carry air to the alveoli.
  4. 4. a machine that takes over breathing for the body when disease causes the lungs to fail.
  5. 5. a flap of skin that prevents food going into the trachea.
  6. 8. the movement of a substance from where it is in high concentration to where it is in lower concentration.