The Respiratory System

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Across
  1. 3. the windpipe
  2. 5. food travels down this
  3. 6. the physical process of moving air in and out of the lungs
  4. 7. tiny grape-like structures where the exchange of oxygen occurs
  5. 9. secretes mucus trapping pathogens & debris
  6. 11. Cage the rib cage
  7. 12. smaller passageways where air passes
  8. 13. the main breathing muscle
Down
  1. 1. the exchange of oxygen and carbon dioxide between the lungs and bloodstream
  2. 2. the throat
  3. 4. part of immune system that fights viruses
  4. 8. spoon shaped cartilage that keeps food out of the trachea
  5. 10. Ridges in the nose that warm the air