Respiratory System

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Across
  1. 1. common passage for food and air
  2. 5. made of elastic cartilage/prevents food into windpipe
  3. 8. made of cartilaginous rings that extend downward which than split into two bronchi
  4. 9. air passages that branch
Down
  1. 2. facilitates the exchange of oxygen and carbon dioxide molecules
  2. 3. Each lung has one (left and right)
  3. 4. includes hair follicles as a first line of defense
  4. 6. voice box
  5. 7. primary organ of respiration