Across
- 4. contracts and relaxes and moves air in and out of the lungs
- 6. a system of organs
- 8. a tubelike passageway at the top of the throat
Down
- 1. bronchioles that end in microscopic sacs
- 2. the main organs of the respiratory system
- 3. movement of air
- 5. air that passes from the pharynx into a triangle-shape
- 7. the trachea branches into 2 narrower tubes