Respiratory system

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Across
  1. 3. also know as windpipe
  2. 6. protects the lower airways
  3. 7. Upon inhalation, the ________ contracts and flattens and the chest cavity enlarges
  4. 9. There are two large sphenoid sinuses in the sphenoid bone, which is behind the nose between the eyes
  5. 10. a group of organs and tissues that work together to help you breathe (left)
Down
  1. 1. a group of organs and tissues that work together to help you breathe (right)
  2. 2. The other sinus
  3. 4. Transports air to the lungs
  4. 5. The ______ are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
  5. 8. The only part of the respiratory system that is externally visable