The Respiratory System
Across
- 1. The large airway with cartilage rings
- 4. The tiny hairs found in the nose
- 6. The gas we don't use and breathe out (no space)
- 9. Where gases pass in and out of the bloodstream
- 10. Our breathing rate does this as we exercise
- 12. The protective bones around our lungs
Down
- 2. A flap over the trachea which keeps out food
- 3. We need oxygen and ....... to produce energy
- 5. The muscle under the lungs used for breathing
- 7. The large airways that branches off into the lungs
- 8. The gas our cells need for respiration
- 11. The useful end product of respiration