Respiratory System

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Across
  1. 5. to breathe in
  2. 6. the ribs and upper backbone, and the organs found in the chest
  3. 7. the movement of air in and out of the lungs
  4. 9. muscular movements which cause air to move into and out of the lungs
  5. 10. the tube that carries air from the nose and mouth down to the lungs
  6. 11. the curved bones attached to vertebral column and supporting the lateral walls of the thorax
  7. 12. membrane strong, slippery membranes which surround each lung
Down
  1. 1. an air sac in the lungs, where gas exchange occurs
  2. 2. to breathe out
  3. 3. a large sheet of muscle that separates the lungs from the abdominal cavity
  4. 4. muscles muscles between the ribs which contract to breathe in
  5. 8. the tube into which the trachea branches, carrying air
  6. 9. the small tubes into which the bronchi branch