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