Across
- 2. action of breathing
- 6. muscular partition separating thorax& abdomen
- 8. external openings of the nasal cavity
- 9. airways that lead from the trachea to lungs
- 11. hollow muscular organ forming an air passage
Down
- 1. Hairlike structure that provides propulsion
- 3. muscular tube connecting the throat & stomach
- 4. membrane-lined cavity behind the mouth
- 5. tiny air sacs in the lungs
- 7. membranous tube reinforced by cartilage
- 10. pair of spongy, air-filled organs