The Respiratory System
Across
- 4. The large airway with cartilage rings
- 5. The protective bones around our lungs
- 6. A flap over the trachea to keep food out
- 7. The muscle under the lungs used for breathing
- 9. The large airways which branch off into the lungs
- 10. The useful end product of respiration
- 11. Our breathing rate does this as we exercise
- 12. We need oxygen and ....... to make energy
Down
- 1. The tiny hairs found in the nose
- 2. The gas our cells need for respiration
- 3. The gas we can't use and breathe out
- 8. Where in the lungs gases pass in and out of the bloodstream