The Respiratory System
Across
- 4. bronchioles that end in microscopic sacs
- 5. the trachea branches into 2 narrower tubes
- 6. interacts with the respiratory system so you can breathe
- 8. contracts and relaxes and moves air in and out of the lungs
- 9. the main organs of the respiratory system
- 10. a flap of tissue at the lower end of the pharynx
Down
- 1. movement of air
- 2. a tubelike passageway at the top of the throat
- 3. a system of organs
- 7. air that passes from the pharynx into a triangle-shape