Across
- 3. any of the major air passages of the lungs
- 7. a large membranous tube reinforced by rings of cartilage
- 9. where you can breath
- 10. a tube that has an internal diameter of hairlike thinness.
Down
- 1. the spreading of something more widely.
- 2. any of the minute branches into which a bronchus divides.
- 4. the part projecting above the mouth on the face of a person
- 5. carbon dioxide or other gaseous carbon compounds released into the atmosphere
- 6. each of the pair of organs situated within the ribcage
- 8. where the lungs and the blood exchange oxygen and carbon dioxide
- 11. each of a series of slender curved bones articulated in pairs to the spine